When1: 1596
When2: 1627
Who: Johannes Kepler [Kepler, Johannes]
What: astronomer
Where: Tübingen, Poland/Prague, Czech Republic
works\ Cosmographic Mystery [1596]; Dream or Astronomy of the Moon [1611]; Harmony of the Universe [1619]; Rudolphian Tables [1627]
Detail: He lived 1571 to 1630 and invented planetary-motion laws (Kepler's laws). Kepler's first law [1609] is planets move in elliptical orbits around Sun, with Sun at one ellipse focus. Kepler's second law [1609] is planets sweep out equal ellipse areas in equal times. Kepler's third law is planet period squared is proportional to average distance from Sun cubed.
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Date Modified: 2022.0224