Kepler-johannes definitions

kĕp'lər
German astronomer and mathematician whose three laws describing the elliptical orbits of celestial bodies provided a basis for Isaac Newton's theory of gravitation.
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German astronomer and mathematician who is considered the founder of celestial mechanics. He was first to accurately describe the elliptical orbits of Earth and the planets around the Sun and demonstrated that planets move fastest when they are closest to the Sun. He also established that a planet's distance from the Sun can be calculated if its period of revolution is known.
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