One of the founders of modern astronomy who discovered the three basic laws of planetary motion, among them that planetary orbits are elliptical. He introduced several minor aspects including the bi-quintile (144°), tredecile (108°), quintile (fifth harmonic, 72°), decile or semi-quintile (36°), quindecile (24°), and the semidecile or vigintile (18°).

See Johannes Kepler. - Refers to 1,000. See Kilo or See Kilobyte.

1571-1630. Mathematician who discovered the Laws of Planetary Motion which bear his name. Also, a rayed crater on the Moon. External Link

A German astronomer and mathematician. Considered a founder of modern astronomy, he formulated three famous laws of planetary motion that comprised a quantitative formulation of Copernicus's theory that the planets revolve around the Sun.

German astronomer and mathematician (1571-1630) who was the first to accurately describe the elliptical orbits of the Earth and the planets round the sun. Demonstrated how a planet's distance from the sun can be calculated.

1571-1630 German astronomer and mathematician. Considered a founder of modern astronomy. Using the positional data carefully collected by Tycho Brahe, Kepler formulated the famous three laws of planetary motion.

Johannes Kepler (1571-1630) was a German mathematician who realized that the planets go around the sun in elliptical orbits. He formulated what we now call "Kepler's Three Laws" of planetary motion that mathematically describe the elliptical orbits of celestial objects. For a few years he worked with Tycho Brahe.

1571-1630 German astronomer and mathematician. Considered a founder of modern astronomy, he formulated the famous three laws of planetary motion. They comprise a quantitative formulation of Copernicus's theory that the planets revolve around the Sun.