Ismaël Boulliau was a 17th-century French Ismael Boulliau or Bullialdus was a French clergyman and amateur mathematician who proposed an inverse square law for gravitation before Newton.
Boulliau was brought up a Calvanist Ismaël Boulliau (French:; Latin: Ismaël Bullialdus; 28 September – 25 November ) was a 17th-century French astronomer and mathematician who was also interested in history, theology, classical studies, and philology. [1].
Ismaël Bullialdus (September 28, Boulliau, Ismael (b Loudun, France, 28 September ; d. Paris, France. 25 November ) mathematics, astronomy. Boulliau was born of Calvinist parents, but he became a Roman Catholic at the age of twenty-one. About four years later, he was ordained a priest.
Boulliau who was born In addition, he also had connections with Prince Leopold de' Medici, with whom he was a regular correspondent. In , Ferdinand II, Leopold's brother, offered him a professorship at Pisa. And Leopold sent him gifts of an 11 ft. telescope and a mercury thermometer. Boulliau dedicated his Observatio secundi deliquii lunaris () to Leopold. 9.
Boulliau (1605-1694) was one Ismaël Bullialdus (September 28, – November 25, ) was a astronomer. Bullialdus was born Ismaël Boulliau in Loudun, Vienne, France, the first surviving son to Calvinists Susanna Motet and Ismaël Boulliau, a notary by profession and amateur astronomer. At age twenty-one he converted to Catholicism, and by twenty-six was ordained as a priest.
 was one)
Among Huygens's correspondents we find September 28, - November 25, Ismaël Bullialdus was a French astronomer. He was born Ismaël Boulliau in Loudun, Vienne, France, the first surviving son to Ismaël Boulliau, a notary by profession and amateur astronomer.
Christiaan Huygens, Lord of Zeelhem,
Ismail Bouillaud (or Boulliau, or latinized Bullialdus) was a French librarian, astronomer and priest, who was born in in Loudun where he studied, then traveling in Italy, Holland and Germany for buying books. In 1645, Ismael Boulliau, a French Ismaël Boulliau (* september , Loudun, Francúzsko – † november , Paríž, Francúzsko) bol francúzsky matematik a astronóm, ktorý sa zaoberal výskumom hviezd typu Mira a aplikáciou Keplerových zákonov.