09 August 2014

Exercise faith, don't measure it. . .


18th Week OT (S)
Fr. Philip Neri Powell, OP
St. Dominic Church, NOLA

How embarrassing for the disciples! Imagine their chagrin. Despite their time with Jesus and their love for him, they can't manage a simple exorcism. While they blush and shuffle their feet, our Lord, sounding disappointed and out-of-sorts, rails at them, “O faithless and perverse generation, how long will I be with you? How long will I endure you?” Faithless and perverse?! Well, that's hardly pastoral. Not very shepherd-like, is it? And then we have that sarcastic rhetorical question: how long will he endure us? Seriously, who's “enduring” whom here? We're trying to learn, so we ask, “Why couldn't we exorcise this guy?” After yelling at us for the ineffectiveness of our “little faith,” he tells us that all it takes to move mountains is to “have faith the size of a mustard seed.” Those things are tiny! Again, seriously, who's enduring whom? Cryptic parables, weird prophecies, inconsistent proverbs, novel prayers. And he expects us to get all this – snap! – like that. Tell us, Lord, what's the difference btw “having little faith” and “having faith the size of a mustard seed”? The problem isn't the size of our faith. The problem is that we don't know what faith is. 

Consider the mustard seed. About 2mm in diameter. Barely larger than a single grain of sand. Less than half of cup of these seeds contains 25g of protein. That's more protein than we find in a 3oz steak. That same half cup contains almost 20g of monounsaturated fat – the good fat that reduces bad cholesterol and increases good cholesterol. Rich in B vitamins and trace metals like iron, calcium, and zinc, that half cup provides nearly 15g of dietary fiber. The mustard seed is a powerhouse of excellent nutrition! So, what do these fascinating nutritional facts have to do with our faith? The size of our faith – big, small, long, or short – has nothing to do with the power of our faith, the ability of our faith to accomplish great things. Faith is not measurable in ounces, feet, pounds, or grams. “More faith” does not mean “better faith.” When Jesus tells us that “faith the size of a mustard seed” can move mountains, he's not measuring the diameter of faith and telling us to collect more seeds. A gallon jug of mustard seeds sitting idly in a pantry can do nothing for high cholesterol, or protein deficiency, or constipation. For those seeds to unleash their full nutritional potential, they must be consumed and allowed to do their natural best. And so it is with faith. 

The supernatural gift of trusting in God is not a thing to be possessed. Like a watch or a pair of shoes. Faith* is a disposition, a temperament; it's a good habit, an instilled inclination to turn ourselves toward God and rely on His love for us to do the work He's given us to do. Our tendency to think of faith in terms of measurable amounts is understandable. We say things like “my faith isn't strong enough,” or “I need a larger faith.” But this way of speaking about faith pushes us into the same problem the disciples encounter this morning. If we rely on the size or weight of our faith to accomplish great things, then we will end in failure every time. If, however, we rely solely on the love of the Father to provide and care for us; if we surrender entirely to His will; if we receive the gift of trusting in Him and exercise this gift like a triathlete at an Olympic gym, mountains will be the smallest things we can move. We can be moved from our fallen human nature, from our inclinations towards disobedience and death and onto our graced end – eternal life. Exercise faith like a vital muscle. Tend it like a prize-winning orchid. And refuse to measure it by the ounces and inches of this world. 

* For those with a more analytical mind, here's a definition of faith from the Catholic Encyclopedia, 1909. "The foregoing analyses will enable us to define an act of Divine supernatural faith as "the act of the intellect assenting to a Divine truth owing to the movement of the will, which is itself moved by the grace of God" (St. Thomas, II-II, Q. iv, a. 2). And just as the light of faith is a gift supernaturally bestowed upon the understanding, so also this Divine grace moving the will is, as its name implies, an equally supernatural and an absolutely gratuitous gift. Neither gift is due to previous study neither of them can be acquired by human efforts, but "Ask and ye shall receive."
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08 August 2014

Praising, blessing, preaching

Laudare + Benedicere + Praedicare



A Blessed Feast Day to all my Dominican 
brothers and sisters! 

How beautiful are your feet?

NB. Deacon John is preaching at this morning's Mass. . .so, here's a 2010 homily for Dominic's feast day.

Solemnity of St. Dominic
Fr. Philip Neri Powell, OP
St. Dominic Church, NOLA

Audio File


Brothers and sisters, I would begin this morning with a question: are your feet beautiful? Up and down the mountains, do you walk with beautiful feet? If you bring glad tidings; announce the Lord's peace; bear his good news; and proclaim salvation through his mercy; if you raise a cry of joy; break into song; rejoice at his marvelous deeds; and give witness to the Lord restoring his people, then your feet are indeed beautiful. Your feet are beautiful b/c they bring you among us as a preacher of the Good News! A prophet of the Lord's salt and light, his blessing and fire. Are your feet beautiful? In word and deed, do you bring his Good News to the world? Do you rejoice, sing, give witness, bear his glad tidings? Are you Christ-for-others out there? We collect ourselves together this morning for one purpose: to become more like Christ than we were yesterday. To accomplish this, we will pray in thanksgiving; hear his Word proclaimed and preached; and we will eat and drink his Body and Blood from the altar. Then we will go out there and present ourselves to the world as evidence, as living, breathing testimony to the truth of the Gospel. We are sons and daughters of the Father. Brothers and sisters to Christ. And with St. Dominic, we are preachers of the Good News! 

Whether we know it or not, we are all preachers. Through baptism, we were all made priests, prophets, and kings along with Christ. Now, let's be honest: some of us are better at preaching than others; all of us have good preaching days and bad ones. There are times when being a witness for the mercy of God is more aggravating than it is delightful. The burden of forgiving those who hate us can be crushing. Most of the time, the temptation to dive into the flow of the world and revel in passion is overwhelming. No Christian who wakes up to an ordinary day can deny that following Christ out there can test one's patience, endurance, and resolve. It would be easier not to bother, safer to just walk away. Jesus knows this, and this is why he says to us, “You are the salt of the earth. . .You are the light of the world.” Salt preserves, enlivens, seasons. Light shines through the darkness, reveals what's hidden. As his disciples, his students, we are charged with being salt and light for one another and for the world. So, not only are we to be preachers, we're to be bright, salty preachers of the Good News! 

Jesus knows all too well the realities of being a faithful servant of the Father in this world. His life and death provide us with ample evidence that preaching the Father's word of mercy is a dangerous gamble for the preacher. Just being a Christian these days, even a bad Christian, invites persecution and death. Look at the mass murder of Christians in Nigeria, Sudan, Egypt, Afghanistan. There have been no car bombs exploding outside American churches yet; however, militant secular humanism, disguised as a human rights movement is building its case against Christ and his Church in the U.S. Through bureaucratic regulations, employment anti-discrimination laws, “hate speech” codes, social engineering in the military, and the redefinition of marriage through judicial fiat, the Church is being bullied out of the public square and silenced as a voice for the least among us. Facing this secular challenge as preachers of the Good News requires more than political savvy and good media skills. It requires courage, strength, perseverance, and, most of all, an absolute trust in God. Given all this, Jesus warns us that though we are the salt of the earth and light for the world, salt can lose its power to season, and a light can be extinguished. How does this happen? How does salt become tasteless and light become darkness? 

To put the question more directly: how do we as faithful preachers of the Good News become “go along to get along” pewsitters? The answer lies in our reading this morning from Isaiah. If we fail to bring glad tidings; fail to announce the Lord's peace; hide his good news under a bushel basket; and only whisper about our salvation through his mercy; if we stifle our cries of joy; break into griping, whining instead of song; begrudge his marvelous deeds; and give witness to only to our disappointment and despair, then our feet, the feet of Christ's preachers, become anything but beautiful. Salt loses its taste when it is stored too long, never used. The fire of the Spirit, its light will dim and go dark unless it is fed. Like any normal human person, we are all prone to being intimidated into silence by ideological opposition, threats of violence and protests, ridicule, and public bullying. And our courage and faithfulness are easily compromised by our sin. Whatever joy we have, whatever elation we may want to express with Christ can be beaten into hushed and private words. Being all too aware of our own sinfulness, our own failings, we can easily be shamed into taking our faith indoors, away from those who are all-too-ready to be offended by it. We can find ways to accept the division of our public and private selves and only show our acceptable faces outside these walls. But when we do these things, we cease being preachers of the Good News. We become dim lights and tasteless salt. 

 Jesus says that we are the salt of the earth and the light of the world. He also says that salt can lose its power to season and light its power to shine. What happens to the preacher who become tasteless and dim? Jesus says, “. . .if salt loses its taste. . .It is no longer good for anything but to be thrown out and trampled underfoot.” When we are confronted by opposition to our preaching, to the proclamation of the Good News with our words and deeds, we must remember that this world passes away; it's nature is change. The kingdom of God is eternal, unchanging. And if we hope at all upon the promises of God, we trust, have full faith in the Spirit's guarantee that we will given what to say, shown what to show when the Enemy sends for us. What we cannot do, as preachers, is run after weak compromises, faithless accommodations, and hope upon the temporary promises of this world's princes. Paul encourages Timothy, “. . .proclaim the word; be persistent whether it is convenient or inconvenient; convince, reprimand, encourage through all patience and teaching.” Paul knows what Christ himself knew: that when made to feel the heat of opposition, we are likely to ask for relief from those who are stoking the fires. Paul writes, “For the time will come when people will not tolerate sound doctrine. . .and will stop listening to the truth and will be diverted to myths.” 21st century myths abound! How tolerant are we of sound doctrine? Do we listen to God's truth and preach it? Or do we beg for negotiation, hoping to just be left alone? 

Do you have the beautiful feet of a preacher? In word and deed, do you bring his Good News to the world? Do you rejoice, sing, give witness, bear his glad tidings? Are you Christ-for-others out there? We are sons and daughters of the Father. Brothers and sisters to Christ. And with St. Dominic, we are preachers of the Good News! In season and out, convenient or inconvenient, shout it out: The Lord is king! And there is no other!



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07 August 2014

Are you skilled in love?

NB. The annual repost of my St Dominic homily from 2007.

Solemnity of St. Dominic, Vespers: Phil 1.3-8
Fr. Philip N. Powell, OP
St Albert the Great Priory, Irving, TX


We begin with an innocent question: are you skilled in love? Do you possess the distinguishing talents, the connoisseur’s gifts for hunting, finding, and cultivating love? If so, Paul is writing to you on this evening feast of St. Dominic, “I am confident of this, that the one who began a good work among you will bring it to completion…” In fact, he is writing to all of us who are skilled in love, promising us the achievement of the Good Work, a sterling finish to the gospel race we have vowed to run. If we are to be graced love-makers, committed craftsman of our Lord’s saving charity—looking to our Dominican brothers and sisters: Jordan, Thomas, Catherine, Rose, Martin, fra. Angelico, Margaret, Lacordaire—if we are to light even the smallest fire among the wet woods of this wearying world, we will imprison our hearts and minds in the gracious, re-creating Word, defending and confirming with every word we speak the Good News of salvation through our Lord Jesus Christ. There is no joy for us in anything less. Our fiery brother, Savonarola, preached the Lord’s Passion, saying, “Our preaching will be refined and not refined, yet everyone can receive it, particularly those skilled in love. Those who are not skilled will know their distance from Love.” And that distance we must make our own and then travel to those who do not yet know Love. Our sister, Catherine of Siena, preached this ministry, saying, “The soul in love with [the Lord’s] truth never ceases to be of service in a small enough way to all the world…” Surely, it is a small enough way for us to walk, gifted as we are with the work of preaching Christ Jesus and skilled in nothing less than giving voice and volume to the advent of our Father’s Kingdom! We can find those who do not yet know Love even when we ourselves forget to love, forget to be Love. From our long history, we Dominicans know that it is never enough for us merely to preach. We must be the preaching—with all our anxieties, human quirks, tongue-tied failures, and even the occasional cold heart. The sacred preaching is never just an imitation of Dominic. We do not channel Hyacinth or Peter of Verona from the pulpit. Love shapes each voice of the Word given the nature of the tongue that speaks it, so that all the syllables of the Gospel will find their artful expression. And all those skilled in love will hear One Word, One Voice, One Herald of the Good News. 

Lord, on this solemn feast of our Holy Father, Dominic, free us from the silent death of fear and worry and jail us in your saving Word. Bring to perfection the Good Work you have begun in us and take us with ready hands and hearts to serve those who are not yet skilled in your Love. Amen.
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Peter's failure is our warning. . .

18th Week OT (Th) 
Fr. Philip Neri Powell, OP 
St. Dominic, NOLA 

The Lord says to Jeremiah that He will make a new covenant with the house of Israel and the house of Judah. He says that this new covenant will not be like the covenant He made with their fathers. This new covenant, He says, will be written upon their hearts, “I will be their God, and they shall be my people.” This is the covenant that Christ comes to establish, the covenant established in the heart of any man, woman, or child who confesses to him, “You are the Christ, the Son of the living God.”

To confess that Jesus is the Christ is to be established as a partaker in the new covenant. That's how the covenant is established. But what does this new covenant look like in action? Jesus gives us a disturbing glimpse into the future of those of confess his name. He tells the disciples that he will go to Jerusalem, suffer greatly, get killed, and rise from the tomb on the third day. Understandably upset by this piece of news, Peter, blurts out, “God forbid, Lord! No such thing shall ever happen to you.” We might expect Jesus to smile knowingly at Peter's expression of distressed love. Or maybe reassure him that all will be well. What we don't expect is Jesus' actual response: “Get behind me, Satan! You are an obstacle to me. You are thinking not as God does, but as men do.” 

Why does Jesus rebuke Peter so callously? Jesus knows two truths about his own end that Peter does not. His death and resurrection will seal the new covenant, freeing all of creation from the death of sin; and, anyone who partakes in the new covenant will serve, suffer, and end their lives on a cross. Peter's outburst tells us that he has yet to grasp the necessity of the cross, the absolute value of dying for the love of one's friends. To confess – “You are the Christ, the Son of the living God” – is to make oneself a sacrifice for love. Peter is Satan b/c he tempts Jesus to forsake his sacrificial mission. Peter is an obstacle, a scandal b/c he places his love for Jesus in the way of God's love for all of creation. Peter is thinking as men do rather than as God does by clutching what he has on earth and forsaking what he has to gain in heaven. 

But despite his miserable failure to see and understand the necessity of the cross, Peter is given is keys to the kingdom and made the rock of the Church. His confession that Jesus is the Christ is the foundation stone, the starting place for building the Body. Coming to know and accept that the cross, and Christ's death on the cross, is the event that swings the world back to the Father – that revelation comes with suffering while preaching His word. Until Peter ceases to tempt others with a worldly love, he is Satan. Until he stops loving Christ as his personal possession, he is an obstacle. Until, he starts thinking with God, he is a man living outside the Word. 

Peter's failure is our warning. If we confess the Sonship of Christ and accept the burdens and freedoms of the new covenant, our love, our eagerness to sacrifice, cannot be stingy, half-hearted, or limited to our earthly loves. Our willingness to serve cannot be restricted to the deserving, or to those who can repay our service. And our thinking – how we deliberate about our choices – cannot be dictated by the customs and conventions of men. We are free in the new covenant to take on the salvation of the world b/c God Himself has freed us in Christ. In Christ, we are Christ, sons of the living God.
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06 August 2014

Neither terrorists nor viruses. . .

Feast of the Transfiguration
Fr. Philip Neri Powell, OP
St. Dominic Church, NOLA

I'll be the first to confess: I can be a bit jaded, world-weary. That is, when it comes to watching the world and the problems we humans create for ourselves, I am more likely than not to think, “Well, that's hardly surprising.” When the news broke about the Ebola virus in Africa, I was concerned but not surprised. When that Malaysian plane was shot down over the Ukraine on the same day that Israel starting blowing up terrorist tunnels in Gaza – not surprised. This morning I read that the federal database for tracking terrorists in the US contains 1.1 million names and that almost 80% of American parents think that their children's lives will be worse than theirs – not surprised. One of the advantages of being a Catholic in this day and age is that very little shocks us. Why? B/c we have an excellent understanding of what it means to be part of the fallen human race. We know sin. Evil is no stranger. If we stopped there – at our fallen, sinful nature – we would be despairing as well as jaded and world-weary. 

Thankfully, right on time, Christ shows us our gifted end; he shows us where we can end up if we trust in God and surrender ourselves to His will. That's the whole reason for the dramatic revelation on Mt. Tabor – to show us our gifted end, to show us where we can end up if we trust in God and surrender ourselves to His will. Jesus takes Peter, James, and John to the mountain top to show them what they can become – transfigured, changed in such a way that they become unflinching beacons of God's living glory. As witnesses to this truth of the faith, Jesus appears with Moses and Elijah – prophets of the Law. The Father sends these two prophets to bear up under the truth that Christ is not only His beloved Son but the literal flesh and blood of His promise of eternal life as well. His promise – to keep us with Him always – is given a figure; it's illustrated, changed into a shape, a form, a person. . .the person of Christ. Radiating His Father's glory, Jesus sees the growing despair of his disciples – our worry and dread – and he injects our flagging hope with a simple tonic, “Rise, and do not be afraid.” Rise. And do not be afraid. Our end, our gifted goal is the glory of the Father. And nothing He has planted will ever be uprooted.
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05 August 2014

Well-planted, or uprooted?


NB. Fr. John Dominic is off on a medical mission. Fr. Mike asked me to take the morning Masses this week.

NB 2.0: Didn't preach this homily at the 8.30am Mass b/c Deacon Lloyd was on duty. I'd forgotten that our deacons preach on Tues and Fri. Oh well. 

18th Week OT (T)
Fr. Philip Neri Powell, OP
St. Dominic Church, NOLA

In revealing a truth of the faith, our Lord undermines a centuries-old religious tradition. At one point, the religious tradition he undermines, washing hands before eating, revealed a truth of the faith. But over time, the act became Its Own Thing. Handwashing before meals became an empty ritual, an almost-complusive, superstitious motion that obscured the truth it once revealed. When Jesus points out that uncleanliness is about what comes out of one's mouth rather than what goes in it, he dumps centuries of tradition and sets the nerves of friend and foe alike to buzzing. You don't have to be a scholar of the Law or a even a particularly religious soul to see the implications of Jesus' rough treatment of religious tradition: if handwashing is a pointless ritual, what other centuries-old traditions are pointless as well? To soothe the scrupulous and instruct the ignorant, our Lord says, “Every plant that my heavenly Father has not planted will be uprooted.” In other words, if God built it, willed it, wanted it. . .it – whatever It is – it will endure. And everything and anything planted by something or someone other than the Father. . .will be destroyed. 
So, the obvious question arises: are you planted by the Father? More specifically, is your faith planted in the Father's will? Or, is your faith planted in something or someone that will inevitably be uprooted? Something like financial security, or religious ritual? Or someone like a favorite politician, or a pastor or a celebrity or a pope? Jesus tells his disciples not to follow the Pharisees b/c when the blind lead the blind they all end up at the bottom of a pit. What makes the Pharisees blind? They are reasonably well-off. Educated. Religious. Politically connected. More popular with the crowds than the Sadducees. They are serious men seeking God's will. But they are blind. Their eyes cannot see b/c they will not to see. They will not see the truth that gives the Law its authority; the goodness that makes the Law holy; or the beauty that graces the Law with its allure. If the Pharisees are blind, then what about the pastors and the celebrities and the popes and anyone else we might be tempted to trust before we trust the Father? If they do not trust the Father, then they too are blind! Go to the Father first; trust Him; then, follow those whose faith manifests the good fruits of the Spirit.

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03 August 2014

HELP!

The Dominican Province of St. Martin de Porres 




If you have enjoyed this blog over the years, please consider giving to the province's 1216 Campaign. This money is used primarily for initial formation -- training our novices and educating our student brothers -- but it also helps with our operating expenses.  

The on-line form allows you to make prayer intentions, which we then take and add to our conventual Masses and hours.

Thanks!
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02 August 2014

Thanks

My Mendicant Thanks to the anonymous donor of Ralph Wood book of sermons, Preaching and Professing from the Wish List.

He's Baptist. . .but he loves Flannery O'Connor and appreciates the sacramental imagination.
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Disease Update

The antibiotics seem to be working on clearing up my Insectoid Induced Leprosy.

And my Ear Innards have finally stopped throbbing and threatening to burst forth in a Gelatinous Spew.

Unfortunately, the pills are making me nauseous.

The wonders of science.

Thanks for the prayers and encouragement!  
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30 July 2014

Bug bites, staph, and the pill

Back from visiting The Parentals.  

I left NOLA two weeks ago with three itchy bug bites. 

I now have about 16 staph-infected bug bites. And an ear infection.

Went to one of those quickie E.R. clinics yesterday. The doc took a culture and gave me some antibiotics.

So. . .four pills a day for 10 days.

Joy.
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29 July 2014

When you're too closed-minded to "google it". . .

NB. This post has rec'd over 7,200 hits. Just to be clear: I did not research/compose this list. I cribbed it from Wikipedia.  There's a link to the Wiki article at the bottom of the post.


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It's a shame that being stupid doesn't actually hurt. . .


Please note:


A


  • José de Acosta (1539–1600) – Jesuit missionary and naturalist who wrote one of the very first detailed and realistic descriptions of the new world
  • François d'Aguilon (1567–1617) – Belgian Jesuit mathematician, physicist, and architect.
  • Lorenzo Albacete (1941) Priest physicist and theologian
  • Albert of Saxony (philosopher) (c. 1320–1390) – German bishop known for his contributions to logic and physics; with Buridan he helped develop the theory that was a precursor to the modern theory of inertia[6]
  • Albertus Magnus (c. 1206–1280) – Dominican friar and Bishop of Regensberg who has been described as "one of the most famous precursors of modern science in the High Middle Ages."[7] Patron saint of natural sciences; Works in physics, logic, metaphysics, biology, and psychology.
  • Giulio Alenio (1582-1649) - Jesuit theologian, astronomer and mathematician. He was sent to the Far East as a missionary and adopted a Chinese name and customs. He wrote 25 books including a cosmography and a Life of Jesus in Chinese.
  • José María Algué (1856–1930) – Priest and meteorologist who invented the barocyclonometer
  • José Antonio de Alzate y Ramírez (1737–1799) – Priest, scientist, historian, cartographer, and meteorologist who wrote more than thirty treatises on a variety of scientific subjects
  • Francesco Castracane degli Antelminelli (1817–1899) – Priest and botanist who was one of the first to introduce microphotography into the study of biology
  • Giovanni Antonelli (1818–1872) – Priest and director of the Ximenian Observatory of Florence who also collaborated on the design of a prototype of the internal combustion engine
  • Nicolò Arrighetti (1709–1767) – Jesuit who wrote treatises on light, heat, and electricity.
  • Giuseppe Asclepi (1706–1776) – Jesuit astronomer and physician who served as director of the Collegio Romano observatory; The lunar crater Asclepi is named after him.

B

  • Roger Bacon (c. 1214–1294) – Franciscan friar who made significant contributions to mathematics and optics and has been described as a forerunner of modern scientific method.
  • Bernardino Baldi (1533–1617) – Abbot, mathematician, and writer
  • Eugenio Barsanti (1821–1864) – Piarist who is the possible inventor of the internal combustion engine
  • Bartholomeus Amicus (1562–1649) – Jesuit wrote on philosophy, mathematics, astronomy, and the concept of vacuum and its relationship with God.
  • Daniello Bartoli (1608–1685) – Bartoli and fellow Jesuit astronomer Niccolò Zucchi are credited as probably having been the first to see the equatorial belts on the planet Jupiter
  • Joseph Bayma (1816–1892) – Jesuit known for work in stereochemistry and mathematics
  • Giacopo Belgrado (1704–1789) – Jesuit professor of mathematics and physics and court mathematician who did experimental work in physics
  • Mario Bettinus (1582–1657) – Jesuit philosopher, mathematician and astronomer; lunar crater Bettinus named after him
  • Giuseppe Biancani (1566–1624) – Jesuit astronomer, mathematician, and selenographer, after whom the crater Blancanus on the Moon is named
  • Jacques de Billy (1602–1679) – Jesuit who has produced a number of results in number theory which have been named after him; published several astronomical tables; The crater Billy on the Moon is named after him.
  • Paolo Boccone (1633–1704) – Cistercian botanist who contributed to the fields of medicine and toxicology
  • Bernard Bolzano (1781–1848) – Priest, mathematician, and logician whose other interests included metaphysics, ideas, sensation, and truth.
  • Anselmus de Boodt (1550–1632) – Canon who was one of the founders of mineralogy
  • Theodoric Borgognoni (1205–1298) – Dominican friar, Bishop of Cervia, and medieval Surgeon who made important contributions to antiseptic practice and anaesthetics
  • Christopher Borrus (1583–1632) – Jesuit mathematician and astronomy who made observations on the magnetic variation of the compass
  • Roger Joseph Boscovich (1711–1787) – Jesuit polymath known for his contributions to modern atomic theory and astronomy
  • Joachim Bouvet (1656–1730) – Jesuit sinologist and cartographer who did his work in China
  • Michał Boym (c. 1612–1659) – Jesuit who was one of the first westerners to travel within the Chinese mainland, and the author of numerous works on Asian fauna, flora and geography.
  • Thomas Bradwardine (c. 1290–1349) – Archbishop of Canturbury and mathematician who helped develop the mean speed theorem; one of the Oxford Calculators
  • Martin Stanislaus Brennan (1845-1927) - Priest and astronomer who wrote several books about science
  • Henri Breuil (1877–1961) – Priest, archaeologist, anthropologist, ethnologist and geologist.
  • Jan Brożek (1585–1652) – Polish canon, polymath, mathematician, astronomer, and physician; the most prominent Polish mathematician of the 17th century
  • Louis-Ovide Brunet (1826–1876) – Priest who was one of the founding fathers of Canadian botany
  • Francesco Faà di Bruno (c. 1825–1888) – Priest and mathematician beatified by Pope John Paul II
  • Ismaël Bullialdus (1605–1694) – Priest, astronomer, and member of the Royal Society; the Bullialdus crater is named in his honor
  • Jean Buridan (c. 1300 – after 1358) – Priest who formulated early ideas of momentum and inertial motion and sowed the seeds of the Copernican revolution in Europe
  • Roberto Busa (1913-2011) - Jesuit wrote a lemmatization of the complete works of St. Thomas Aquinas (Index Thomisticus) which was later digitalized by IBM.

C

  • Niccolò Cabeo (1586–1650) – Jesuit mathematician; the crater Cabeus is named in his honor
  • Nicholas Callan (1799–1846) – Priest & Irish scientist best known for his work on the induction coil
  • Jean Baptiste Carnoy (1836–1899) – Priest who has been called the founder of the science of cytology[by whom?]
  • Giovanni di Casali (died c. 1375) – Franciscan friar who provided a graphical analysis of the motion of accelerated bodies
  • Paolo Casati (1617–1707) – Jesuit mathematician who wrote on astronomy and vacuums; The crater Casatus on the Moon is named after him.
  • Laurent Cassegrain (1629–1693) – Priest who was the probable namesake of the Cassegrain telescope; The crater Cassegrain on the Moon is named after him
  • Benedetto Castelli (1578–1643) – Benedictine mathematician; long-time friend and supporter of Galileo Galilei, who was his teacher; wrote an important work on fluids in motion
  • Bonaventura Cavalieri (1598–1647) – Jesuate known for his work on the problems of optics and motion, work on the precursors of infinitesimal calculus, and the introduction of logarithms to Italy. Cavalieri's principle in geometry partially anticipated integral calculus; the lunar crater Cavalerius is named in his honor
  • Antonio José Cavanilles (1745–1804) – Priest and leading Spanish taxonomic botanist of the 18th century
  • Francesco Cetti (1726–1778) – Jesuit zoologist and mathematician
  • Tommaso Ceva (1648–1737) – Jesuit mathematician and professor who wrote treatises on geometry, gravity, and arithmetic
  • Christopher Clavius (1538–1612) – Respected Jesuit Astronomer and mathematician who headed the commission that yielded the Gregorian calendar; wrote influential astronomical textbook.
  • Guy Consolmagno (1952– ) – Jesuit astronomer and planetary scientist
  • Nicolaus Copernicus (1473–1543) –Renaissance astronomer and canon famous for his heliocentric cosmology that set in motion the Copernican Revolution
  • Vincenzo Coronelli (1650–1718) – Franciscan cosmographer, cartographer, encyclopedist, and globe-maker
  • George Coyne (1933– ) – Jesuit astronomer and former director of the Vatican Observatory
  • James Cullen (mathematician) (1867–1933) – Jesuit mathematician who published what is now known as Cullen numbers in number theory
  • James Curley (astronomer) (1796–1889) – Jesuit who was the first director of Georgetown Observatory and determined the latitude and longitude of Washington D.C.
  • Albert Curtz (1600–1671) – Jesuit astronomer who expanded on the works of Tycho Brahe and contributed to early understanding of the moon; The crater Curtius on the Moon is named after him.
  • Johann Baptist Cysat (1587–1657) – Jesuit mathematician and astronomer, after whom the lunar crater Cysatus is named; published the first printed European book concerning Japan; one of the first to make use of the newly developed telescope; most important work was on comets
  • Jean-Baptiste Chappe d'Auteroche (1722-1769) - Priest and astronomer best known for his observations of the transits of Venus

D

  • Ignazio Danti (1536–1586) – Dominican mathematician, astronomer, cosmographer, and cartographer
  • Armand David (1826–1900) – Lazarist priest, zoologist, and botanist who did important work in these fields in China
  • Francesco Denza (1834–1894) – Barnabite meteorologist, astronomer, and director of Vatican Observatory
  • Václav Prokop Diviš (1698–1765) – Czech priest who studied the lightning rod independent of Franklin and constructed the first electrified musical instrument in history
  • Johann Dzierzon (1811–1906) – Priest and pioneering apiarist who discovered the phenomenon of parthenogenesis among bees, and designed the first successful movable-frame beehive; has been described as the "father of modern apiculture"

F

  • Francesco Faà di Bruno (c. 1825–1888) – Priest and mathematician beatified by Pope John Paul II
  • Honoré Fabri (1607–1688) – Jesuit mathematician and physicist
  • Jean-Charles de la Faille (1597–1652) – Jesuit mathematician who determined the center of gravity of the sector of a circle for the first time
  • Gabriele Falloppio (1523–1562) – Canon and one of the most important anatomists and physicians of the sixteenth century. The Fallopian tubes, which extend from the uterus to the ovaries, are named for him.
  • Gyula Fényi (1845–1927) – Jesuit astronomer and director of the Haynald Observatory; noted for his observations of the sun; The crater Fényi on the Moon is named after him
  • Louis Feuillée (1660–1732) – Minim explorer, astronomer, geographer, and botanist
  • Placidus Fixlmillner (1721–1791) – Benedictine priest and one of the first astronomers to compute the orbit of Uranus
  • Paolo Frisi (1728–1784) – Priest, mathematician, and astronomer who did significant work in hydraulics
  • José Gabriel Funes (1963– ) – Jesuit astronomer and current director of the Vatican Observatory

G

  • Joseph Galien (1699 – c. 1762) – Dominican professor who wrote on aeronautics, hailstorms, and airships
  • Jean Gallois (1632–1707) – French scholar, abbot, and member of Academie des sciences
  • Pierre Gassendi (1592–1655) – French priest, astronomer, and mathematician who published the first data on the transit of Mercury; best known intellectual project attempted to reconcile Epicurean atomism with Christianity
  • Agostino Gemelli (1878–1959) – Franciscan physician and psychologist; founded Catholic University of the Sacred Heart in Milan
  • Johannes von Gmunden (c. 1380–1442) – Canon, mathematician, and astronomer who compiled astronomical tables; Asteroid 15955 Johannesgmunden named in his honor
  • Carlos de Sigüenza y Góngora (1645–1700) – Priest, polymath, mathematician, astronomer, and cartographer; drew the first map of all of New Spain
  • Andrew Gordon (Benedictine) (1712–1751) – Benedictine monk, physicist, and inventor who made the first electric motor
  • Christoph Grienberger (1561–1636) – Jesuit astronomer after whom the crater Gruemberger on the Moon is named; verified Galileo's discovery of Jupiter's moons.
  • Francesco Maria Grimaldi (1618–1663) – Jesuit who discovered the diffraction of light (indeed coined the term "diffraction"), investigated the free fall of objects, and built and used instruments to measure geological features on the moon
  • Robert Grosseteste (c. 1175 – 1253) – Bishop who was one of the most knowledgeable men of the Middle Ages; has been called "the first man ever to write down a complete set of steps for performing a scientific experiment."[8]
  • Paul Guldin (1577–1643) – Jesuit mathematician and astronomer who discovered the Guldinus theorem to determine the surface and the volume of a solid of revolution
  • Bartolomeu de Gusmão (1685–1724) – Jesuit known for his early work on lighter-than-air airship design

H

  • Johann Georg Hagen (1847–1930) – Jesuit director of the Georgetown and Vatican Observatories; The crater Hagen on the Moon is named after him
  • Nicholas Halma (1755–1828) – French abbot, mathematician, and translator
  • Jean-Baptiste du Hamel (1624–1706) – French priest, natural philosopher, and secretary of the Academie Royale des Sciences
  • René Just Haüy (1743–1822) – Priest known as the father of crystallography
  • Maximilian Hell (1720–1792) – Jesuit astronomer and director of the Vienna Observatory; the crater Hell on the Moon is named after him.
  • Michał Heller (1936– ) – Priest, Templeton Prize winner, and prolific writer on numerous scientific topics
  • Lorenz Hengler (1806–1858) – Priest often credited as the inventor of the horizontal pendulum
  • Hermann of Reichenau (1013–1054) – Benedictine historian, music theorist, astronomer, and mathematician
  • Pierre Marie Heude (1836–1902) – Jesuit missionary and zoologist who studied the natural history of Eastern Asia
  • Franz von Paula Hladnik (1773–1844) – Priest and botanist who discovered several new kinds of plants, and certain genera have been named after him
  • Giovanni Battista Hodierna (1597–1660) – Priest and astronomer who catalogued nebulous objects and developed an early microscope
  • Victor-Alphonse Huard (1853–1929) – Priest, naturalist, educator, writer, and promoter of the natural sciences

I

  • Maximus von Imhof (1758–1817) – German Augustinian physicist and director of the Munich Academy of Sciences
  • Giovanni Inghirami (1779–1851) – Italian Piarist astronomer who has a valley on the moon named after him as well as a crater

J

  • François Jacquier (1711–1788) – Franciscan mathematician and physicist; at his death he was connected with nearly all the great scientific and literary societies of Europe
  • Stanley Jaki (1924–2009) – Benedictine priest and prolific writer who wrote on the relationship between science and theology
  • Ányos Jedlik (1800–1895) – Benedictine engineer, physicist, and inventor; considered by Hungarians and Slovaks to be the unsung father of the dynamo and electric motor

K

  • Georg Joseph Kamel (1661–1706) – Jesuit missionary and botanist who established the first pharmacy in the Philippines
  • Karl Kehrle (1898-1996) - Benedictine Monk of Buckfast Abbey, England. Beekeeper. World authority on bee breeding, developer of the Buckfast bee.
  • Otto Kippes (1905–1994) – Priest acknowledged for his work in asteroid orbit calculations; the main belt asteroid 1780 Kippes was named in his honour
  • Athanasius Kircher (1602–1680) – Jesuit who has been called the father of Egyptology and "Master of a hundred arts"; wrote an encyclopedia of China; one of the first people to observe microbes through a microscope
  • Wenceslas Pantaleon Kirwitzer (1588–1626) – Jesuit astronomer and missionary who published observations of comets
  • Jan Krzysztof Kluk (1739–1796) – Priest, naturalist agronomist, and entomologist who wrote a multi-volume work on Polish animal life
  • Marian Wolfgang Koller (1792–1866) – Benedictine professor who wrote on astronomy, physics, and meteorology
  • Franz Xaver Kugler (1862–1929) – Jesuit chemist, mathematician, and Assyriologist who is most noted for his studies of cuneiform tablets and Babylonian astronomy

L

  • Ramon Llull (ca. 1232 – ca. 1315) Majorcan writer and philosopher, logician and a Franciscan tertiary considered a pioneer of computation theory
  • Nicolas Louis de Lacaille (1713-1762) - French deacon and astronomer noted for cataloguing stars, nebulous objects, and constellations
  • Eugene Lafont (1837–1908) – Jesuit physicist, astronomer, and founder of the first Scientific Society in India
  • Antoine de Laloubère (1600–1664) – Jesuit and first mathematician to study the properties of the helix
  • Bernard Lamy (1640–1715) – Oratorian philosopher and mathematician who wrote on the parallelogram of forces
  • Pierre André Latreille (1762–1833) – Priest and entomologist whose works describing insects assigned many of the insect taxa still in use today
  • Georges Lemaître (1894–1966) – Priest and father of the Big Bang Theory
  • Thomas Linacre (c. 1460–1524) – English priest, humanist, translator, and physician
  • Francis Line (1595–1675) – Jesuit magnetic clock and sundial maker who disagreed with some of the findings of Newton and Boyle
  • Juan Caramuel y Lobkowitz (1606–1682) – Cistercian who wrote on a variety of scientific subjects, including probability theory

M

  • Jean Mabillon (1632–1707) – Benedictine monk and scholar, considered the founder of palaeography and diplomatics
  • James B. Macelwane (1883–1956) – "The best-known Jesuit seismologist" and "one of the most honored practicioners of the science of all time"; wrote the first textbook on seismology in America.
  • John MacEnery (1797-1841) - Archaeologist who investigated the Palaeolithic remains at Kents Cavern
  • Paul McNally (1890–1955) – Jesuit astronomer and director of Georgetown Observatory; the crater McNally on the Moon is named after him.
  • Manuel Magri (1851–1907) – Jesuit ethnographer, archaeologist and writer; one of Malta's pioneers in archaeology
  • Emmanuel Maignan (1601–1676) – Minim physicist and professor of medicine who published works on gnomonics and perspective
  • Charles Malapert (1581–1630) – Jesuit writer, astronomer, and proponent of Aristotelian cosmology; also known for observations of sunpots and of the lunar surface, and the crater Malapert on the Moon is named after him
  • Nicolas Malebranche (1638–1715) – Oratorian philosopher who studied physics, optics, and the laws of motion and disseminated the ideas of Descartes and Leibniz
  • Marcin of Urzędów (c. 1500–1573) – Priest, physician, pharmacist, and botanist
  • Joseph Maréchal (1878–1944) – Jesuit philosopher and psychologist
  • Marie-Victorin (1885–1944) – Christian Brother and botanist best known as the father of the Jardin botanique de Montréal
  • Edme Mariotte (c. 1620–1684) – Priest and physicist who recognized Boyle's Law and wrote about the nature of color
  • Francesco Maurolico (1494–1575) – Benedictine who made contributions to the fields of geometry, optics, conics, mechanics, music, and astronomy, and gave the first known proof by mathematical induction
  • Christian Mayer (astronomer) (1719–1783) – Jesuit astronomer most noted for pioneering the study of binary stars
  • James Robert McConnell (1915-1999) - Irish Theoretical Physicist, Pontifical Academician, Monsignor
  • Gregor Mendel (1822–1884) – Augustinian monk and father of genetics
  • Pietro Mengoli (1626–1686) – Priest and mathematician who first posed the famous Basel Problem
  • Giuseppe Mercalli (1850–1914) – Priest, volcanologist, and director of the Vesuvius Observatory who is best remembered today for his Mercalli scale for measuring earthquakes which is still in use
  • Marin Mersenne (1588–1648) – Minim philosopher, mathematician, and music theorist who is often referred to as the "father of acoustics"
  • Paul of Middelburg (1446–1534) – Bishop of Fossombrone who wrote important works on the reform of the calendar
  • Maciej Miechowita (1457–1523) – Canon who wrote the first accurate geographical and ethnographical description of Eastern Europe, as well as two medical treatises
  • François-Napoléon-Marie Moigno (1804–1884) – Jesuit physicist and mathematician; was an expositor of science and translator rather than an original investigator
  • Juan Ignacio Molina (1740–1829) – Jesuit naturalist, historian, botanist, ornithologist and geographer
  • Louis Moréri (1643–1680) – 17th century priest and encyclopaedist
  • Théodore Moret (1602–1667) – Jesuit mathematician and author of the first mathematical dissertations ever defended in Prague; the lunar crater Moretus is named after him.
  • Landell de Moura (1861–1928) – Priest and inventor who was the first to accomplish the transmission of the human voice by a wireless machine
  • Gabriel Mouton (1618–1694) – Abbot, mathematician, astronomer, and early proponent of the metric system
  • Jozef Murgaš (1864–1929) – Priest who contributed to wireless telegraphy and help develop mobile communications and wireless transmission of information and human voice
  • José Celestino Mutis (1732–1808) – Canon, botanist, and mathematician who led the Royal Botanical Expedition of the New World

N

  • Jean François Niceron (1613–1646) – Minim mathematician who studied geometrical optics
  • Nicholas of Cusa (1401–1464) – Cardinal, philosopher, jurist, mathematician, astronomer, and one of the great geniuses and polymaths of the 15th century
  • Julius Nieuwland (1878–1936) – Holy Cross priest, known for his contributions to acetylene research and its use as the basis for one type of synthetic rubber, which eventually led to the invention of neoprene by DuPont
  • Jean-Antoine Nollet (1700–1770) – Abbot and physicist who discovered the phenomenon of osmosis in natural membranes.

O

  • Hugo Obermaier (1877–1946) – Priest, prehistorian, and anthropologist who is known for his work on the diffusion of mankind in Europe during the Ice Age, as well as his work with north Spanish cave art
  • William of Ockham (c. 1288 – c. 1348) – Franciscan Scholastic who wrote significant works on logic, physics, and theology; known for Ockham's Razor
  • Nicole Oresme (c. 1323–1382) – One of the most famous and influential philosophers of the later Middle Ages; economist, mathematician, physicist, astronomer, philosopher, theologian and Bishop of Lisieux, and competent translator; one of the most original thinkers of the 14th century
  • Barnaba Oriani (1752–1832) – Barnabite geodesist, astronomer and scientist whose greatest achievement was his detailed research of the planet Uranus, and is also known for Oriani's theorem

P

  • Luca Pacioli (c. 1446–1517) – Franciscan friar who published several works on mathematics and is often regarded as the Father of Accounting
  • Ignace-Gaston Pardies (1636–1673) – Jesuit physicist known for his correspondence with Newton and Descartes
  • Franciscus Patricius (1529–1597) – Priest, cosmic theorist, philosopher, and Renaissance scholar
  • John Peckham (1230–1292) – Archbishop of Canterbury and early practitioner of experimental science
  • Nicolas Claude Fabri de Peiresc (1580–1637) – Abbot and astromer who discovered the Orion Nebula; lunar crater Peirescius named in his honor
  • Stephen Joseph Perry (1833–1889) – Jesuit astronomer and Fellow of the Royal Society; made frequent observations of Jupiter's satellites, of stellar occultations, of comets, of meteorites, of sun spots, and faculae
  • Giambattista Pianciani (1784–1862) – Jesuit mathematician and physicist
  • Giuseppe Piazzi (1746–1826) – Theatine mathematician and astronomer who discovered Ceres, today known as the largest member of the asteroid belt; also did important work cataloguing stars
  • Jean Picard (1620–1682) – Priest and first person to measure the size of the Earth to a reasonable degree of accuracy; also developed what became the standard method for measuring the right ascension of a celestial object; The PICARD mission, an orbiting solar observatory, is named in his honor
  • Edward Pigot (1858–1929) – Jesuit seismologist and astronomer
  • Alexandre Guy Pingré (1711–1796) – French priest astronomer and naval geographer; the crater Pingré on the Moon is named after him, as is the asteroid 12719 Pingré
  • Andrew Pinsent (1966- ) – Priest whose current research includes the application of insights from autism and social cognition to 'second-person' accounts of moral perception and character formation. His previous scientific research contributed to the DELPHI experiment at CERN
  • Jean Baptiste François Pitra (1812–1889) – Bendedictine cardinal, archaeologist and theologian who noteworthy for his great archaeological discoveries
  • Charles Plumier (1646–1704) – Minim friar who is considered one of the most important botanical explorers of his time
  • Marcin Odlanicki Poczobutt (1728–1810) – Jesuit astronomer and mathematician; granted the title of the King's Astronomer; the crater Poczobutt on the Moon is named after him.
  • Léon Abel Provancher (1820–1892) – Priest and naturalist devoted to the study and description of the fauna and flora of Canada; his pioneer work won for him the appellation of the "Father of Natural History in Canada"

R

  • Louis Receveur (1757–1788) – Franciscan naturalist and astronomer; described as being as close as one could get to being an ecologist in the 18th century
  • Franz Reinzer (1661–1708) – Jesuit who wrote an in-depth meteorological, astrological, and political compendium covering topics such as comets, meteors, lightning, winds, fossils, metals, bodies of water, and subterranean treasures and secrets of the earth
  • Louis Rendu (1789–1859) – Bishop who wrote an important book on the mechanisms of glacial motion; the Rendu Glacier, Alaska, U.S. and Mount Rendu, Antarctica are named for him
  • Vincenzo Riccati (1707–1775) – Italian Jesuit mathematician and physicist
  • Matteo Ricci (1552–1610) – One of the founding fathers of the Jesuit China Mission and co-author of the first European-Chinese dictionary
  • Giovanni Battista Riccioli (1598–1671) – Jesuit astronomer who authored Almagestum novum, an influential encyclopedia of astronomy; The first person to measure the rate of acceleration of a freely falling body; created a selenograph with Father Grimaldi that now adorns the entrance at the National Air and Space Museum in Washington D.C.
  • Richard of Wallingford (1292-1336) - Abbot, renowned clockmaker, and one of the initiators of western trigonometry
  • Johannes Ruysch (c. 1460–1533) – Priest, explorer, cartographer, and astronomer who created the second oldest known printed representation of the New World

S

  • Giovanni Girolamo Saccheri (1667–1733) – Jesuit mathematician and geometer
  • Johannes de Sacrobosco (c. 1195 – c. 1256) – Irish monk and astronomer who wrote the authoritative medieval astronomy text Tractatus de Sphaera; his Algorismus was the first text to introduce Hindu-Arabic numerals and procedures into the European university curriculum; the lunar crater Sacrobosco is named after him
  • Gregoire de Saint-Vincent (1584–1667) – Jesuit mathematician who made important contributions to the study of the hyperbola
  • Alphonse Antonio de Sarasa (1618–1667) – Jesuit mathematician who contributed to the understanding of logarithms
  • Christoph Scheiner (c. 1573–1650) – Jesuit physicist, astronomer, and inventor of the pantograph; wrote on a wide range of scientific subjects
  • Wilhelm Schmidt (linguist) (1868–1954) – Austrian priest, linguist, anthropologist, and ethnologist.
  • George Schoener (1864–1941) – Priest who became known in the United States as the "Padre of the Roses" for his experiments in rose breeding
  • Gaspar Schott (1608–1666) – Jesuit physicist, astronomer, and natural philosopher who is most widely known for his works on hydraulic and mechanical instruments
  • Franz Paula von Schrank (1747–1835) – Priest, botanist, entomologist, and prolific writer
  • Berthold Schwarz (c. 14th century) – Franciscan friar and reputed inventor of gunpowder and firearms
  • Anton Maria Schyrleus of Rheita (1604–1660) – Capuchin astronomer and optrician who built Kepler's telescope
  • George Mary Searle (1839–1918) – Paulist astronomer and professor who discovered six galaxies
  • Angelo Secchi (1818–1878) – Jesuit pioneer in astronomical spectroscopy, and one of the first scientists to state authoritatively that the sun is a star
  • Alessandro Serpieri (1823–1885) – Priest, astronomer, and seismologist who studied shooting stars, and was the first to introduce the concept of the seismic radiant
  • Gerolamo Sersale (1584–1654) – Jesuit astronomer and selenographer; his map of the moon can be seen in the Naval Observatory of San Fernando; the lunar crater Sirsalis is named after him
  • Benedict Sestini (1816–1890) – Jesuit astronomer, mathematician and architect; studied sunspots and eclipses; wrote textbooks on a variety of mathematical subjects
  • René François Walter de Sluse (1622–1685) – Canon and mathematician with a family of curves named after him
  • Lazzaro Spallanzani (1729–1799) – Priest, biologist, and physiologist who made important contributions to the experimental study of bodily functions, animal reproduction, and essentially discovered echolocation; his research of biogenesis paved the way for the investigations of Louis Pasteur
  • Valentin Stansel (1621–1705) – Jesuit astronomer who made important observations of comets
  • Johan Stein (1871–1951) – Jesuit astronomer and director of the Vatican Observatory, which he modernized and relocated to Castel Gandolfo; the crater Stein on the far side of the Moon is named after him
  • Nicolas Steno (1638–1686) – Bishop beatified by Pope John Paul II who is often called the father of geology[9] and stratigraphy[7], and is known for Steno's principles
  • Pope Sylvester II (c. 946–1003) – Prolific scholar who endorsed and promoted Arabic knowledge of arithmetic, mathematics, and astronomy in Europe, reintroducing the abacus and armillary sphere which had been lost to Europe since the end of the Greco-Roman era
  • Alexius Sylvius Polonus (1593 – c. 1653) – Jesuit astronomer who studied sunspots and published a work on calendariography
  • Ignacije Szentmartony (1718–1793) – Jesuit cartographer, mathematician, and astronomer who became a member of the expedition that worked on the rearrangement of the frontiers among colonies in South America

T

  • André Tacquet (1612–1660) – Jesuit mathematician whose work laid the groundwork for the eventual discovery of calculus
  • Pierre Teilhard de Chardin (1881–1955) – Jesuit paleontologist and geologist who took part in the discovery of Peking Man
  • Francesco Lana de Terzi (c. 1631–1687) – Jesuit referred to as the Father of Aviation[10] for his pioneering efforts; he also developed a blind writing alphabet prior to Braille.
  • Theodoric of Freiberg (c. 1250 – c. 1310) – Dominican theologian and physicist who gave the first correct geometrical analysis of the rainbow
  • Joseph Tiefenthaler (1710–1785) – Jesuit who was one of the earliest European geographers to write about India
  • Giuseppe Toaldo (1719–1797) – Priest and physicist who studied atmospheric electricity and did important work with lightning rods; the asteroid 23685 Toaldo is named for him.
  • José Torrubia (c. 1700–1768) – Franciscan linguist, scientist, collector of fossils and books, and writer on historical, political and religious subjects
  • Franz de Paula Triesnecker (1745–1817) – Jesuit astronomer and director of the Vienna Observatory; published a number of treatises on astronomy and geography; the crater Triesnecker on the Moon is named after him.

V

  • Luca Valerio (1552–1618) – Jesuit mathematician who developed ways to find volumes and centers of gravity of solid bodies
  • Pierre Varignon (1654–1722) – Priest and mathematician whose principle contributions were to statics and mechanics; created a mechanical explanation of gravitation
  • Jacques de Vaucanson (1709–1782) – French Minim friar inventor and artist who was responsible for the creation of impressive and innovative automata and machines such as the first completely automated loom.
  • Giovanni Battista Venturi (1746–1822) – Priest who discovered the Venturi effect
  • Fausto Veranzio (c. 1551–1617) – Bishop, polymath, inventor, and lexicographer
  • Ferdinand Verbiest (1623–1688) – Jesuit astronomer and mathematician; designed what some claim to be the first ever self-propelled vehicle – many claim this as the world's first automobile
  • Francesco de Vico (1805–1848) – Jesuit astronomer who discovered or co-discovered a number of comets; also made observations of Saturn and the gaps in its rings; the lunar crater De Vico and the asteroid 20103 de Vico are named after him
  • Vincent of Beauvais (c.1190–c.1264) – Dominican who wrote the most influential encyclopedia of the Middle Ages
  • Benito Viñes (1837–1893) – Jesuit meteorologist who made the first weather model to predict the trajectory of a hurricane. [11] [12] [13]
  • János Vitéz (archbishop) (c.1405–1472) – Archbishop, astronomer, and mathematician

W

  • Martin Waldseemüller (c. 1470–1520) – German priest and cartographer who, along with Matthias Ringmann, is credited with the first recorded usage of the word America
  • Godefroy Wendelin (1580–1667) – Priest and astronomer who recognized that Kepler's third law applied to the satellites of Jupiter; the lunar crate Vendelinus is named in his honor
  • Johannes Werner (1468–1522) – Priest, mathematician, astronomer, and geographer
  • Witelo (c. 1230 – after 1280, before 1314) – Friar, physicist, natural philosopher, and mathematician; lunar crater Vitello named in his honor; his Perspectiva powerfully influenced later scientists, in particular Johannes Kepler
  • Julian Tenison Woods (1832–1889) – Passionist geologist and mineralogist
  • Theodor Wulf (1868–1946) – Jesuit physicist who was one of the first experimenters to detect excess atmospheric radiation
  • Franz Xaver von Wulfen (1728-1805) - Jesuit botanist, mineralogist, and alpinist

Z

  • John Zahm (1851–1921) – Holy Cross priest and South American explorer
  • Giuseppe Zamboni (1776–1846) – Priest and physicist who invented the Zamboni pile, an early electric battery similar to the Voltaic pile
  • Francesco Zantedeschi (1797–1873) – Priest who was among the first to recognize the marked absorption by the atmosphere of red, yellow, and green light; published papers on the production of electric currents in closed circuits by the approach and withdrawal of a magnet, thereby anticipating Michael Faraday's classical experiments of 1831[14]
  • Niccolò Zucchi (1586–1670) – claimed to have tried to build a reflecting telescope in 1616 but abandoned the idea (maybe due to the poor quality of the mirror).[15] May have been the first to see the belts on the planet Jupiter (1630).[16]
  • Giovanni Battista Zupi (c. 1590–1650) – Jesuit astronomer, mathematician, and first person to discover that the planet Mercury had orbital phases; the crater Zupus on the Moon is named after him.
And these are just the clerics! [Drops mic and walks away]

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