Ismael Bullialdus

Ismael Bullialdus (Boulliaud, Boulliau) (September 28, 1605 – November 25, 1694) was a French astronomer. He was born in Loudun, Vienne, France.

In 1640, he suggested that the force of gravity follows an inverse-square law. (Isaac Newton made this idea precise in his 1687 work, the Principia.)

Ismael Bullialdus died in Paris, France.

External links

• Short biography
• Longer biography (in French)