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kepler, johannes

kepler, johannes in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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kepler, johannes in Culture

Kepler, Johannes definition

A German astronomer of the late sixteenth and early seventeenth centuries. Kepler's three laws governing the motion of the planets made modern astronomy possible. His first law includes his discovery that the orbits of the planets are ellipses.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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