Willebrord Snel

Willebrord Snel, a Dutch physical scientist, died Oct. 30, 1626, at the age of about 46. Snel (or Snellius or Snell) did important work in astronomy, mathematics, optics, and geodesy, and he has his name attached to the law of refraction of light (Snell’s law),…

Michael Maestlin

Michael Maestlin, a German astronomer, was born Sep. 30, 1550. Maestlin taught astronomy at the University of Tübingen, in southwestern Germany. In the 50 years that had passed since Copernicus proposed that the earth is a planet and moves around the sun…