Philippe de La Hire

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Philippe de La Hire in a contemporary portrait

Philippe de La Hire (born March 18, 1640 in Paris , † April 21, 1718 ibid) was a French mathematician .

Trained as an artist , he traveled to Italy for four years to improve his artistic skills. He also learned the basics of geometry .

He first made himself known through a series of important works on conic sections , mechanics, hydrostatics, etc. a. as well as by his map of France, published with Jean Picard on Jean-Baptiste Colbert's order, and his leveling carried out with a view to a water supply for Versailles .

He was the first to prove that the hypotrochoids of the Cardanic circles are all ellipses and developed an elliptical circle from them .

In 1678 he was elected to the Académie des Sciences . The Mons La Hire on the earth's moon is named after him.

In 1708 he calculated the size of the cardioids .

His son Gabriel Philippe de La Hire continued his triangulation of the meridian arc north of Paris, with which Picard's arc was extended.

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SURNAME La Hire, Philippe de
BRIEF DESCRIPTION French mathematician
DATE OF BIRTH March 18, 1640
PLACE OF BIRTH Paris
DATE OF DEATH April 21, 1718
Place of death Paris