Jean-Charles della Faille
A Jesuit mathematician who solved the ancient puzzle of a triangle's center of gravity, merging devout faith with rigorous geometry.
1597–1652 (age 55)·Flemish Jesuit mathematician·Birthday: March 1
Biography
Jean-Charles della Faille entered the world during the Spanish Netherlands' golden age of art and science. Joining the Society of Jesus, he found within its disciplined ranks the perfect environment to pursue his twin passions: theology and mathematics. He taught across Europe, from Louvain to Madrid, influencing a generation of scholars. His magnum opus, published in 1632, was a definitive geometric proof determining the center of gravity of a circular sector. This work settled a question that had lingered since antiquity and showcased the potent blend of classical learning and modern methodology championed by Jesuit scientists. Della Faille's legacy is that of a bridge builder, applying the exacting tools of mathematics to universal physical principles, all while serving his religious order as a royal cosmographer and educator.
#1 When Jean-Charles Was Born
The biggest hits of 1597
Jean-Charles's Life & Times
The world at every milestone
1597Born
1602Started school
1610Became a teenager
1613Could drive
1615Could vote
1618Turned 21
1627Turned 30
1637Turned 40
1647Turned 50
1652Died at 55
Key Achievements
- Authored 'Theoremata de centro gravitatis partium circuli et ellipsis', providing the first correct proof for the center of gravity of a circular sector.
- Served as a mathematics tutor to the Spanish royal family, including Don John of Austria.
- Held the position of cosmographer to the Council of the Indies in Spain.
- Was a respected professor at the Jesuit Imperial College in Madrid.
Did You Know?
His portrait was painted by Anthony van Dyck, indicating his high status.
He calculated the magnetic declination of various cities for navigational purposes.
Despite his Flemish birth, he spent much of his career in Spain.
A crater on the Moon is named after him.
“I have determined the center of gravity of a circular sector.”
