René Descartes, a French philosopher and mathematician, born 159, died 1650. See biography, below.

René (1596-1650): French philosopher and scientist who took refuge in Holland, one of the founders of naturalist philosophy and the modern scientific method.

Rene 1596-1650 René Descartes was a French philosopher and mathematician whose work, La géométrie, includes his application of algebra to geometry from which we now have Cartesian geometry ( Cartesian coordinates)

Lunar highlands site of the Apollo 16 landing on April 21, 1972.

Descartes is a heavily-worn lunar crater that is located in the rugged south-central highlands of the Moon. To the southwest is the Abulfeda crater.

descartes is an easy-to-learn interactive 2D plot program. It can plot images, xy-data, and arbitrary mathematical functions. Function parameters can be tuned with sliders, and functions can be automatically fitted to data.