Jacques de Billy

Jacques de Billy (March 18, 1602 – January 14, 1679) was a French Jesuit mathematician.

He also served as rector of a number of Jesuit Colleges in Châlons-en-Champagne, Langres and in Sens.

The mathematician Claude Gaspard Bachet de Méziriac, who had been a pupil of Billy's at Rheims, became a close friend.

First published in Dijon by Pierre Palliot in 1656, Billy's tables of eclipses is called Tabulae Lodoicaeae seu universa eclipseon doctrina tabulis, praeceptis ac demonstrationibus explicata.

Adiectus est calculus, aliquot eclipseon solis & lunae, quae proxime per totam Europam videbuntur.