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Kepler's laws
noun Astronomy.
three laws governing planetary motion: each planet revolves in an ellipse, with the sun at one focus; the line connecting a planet to the sun sweeps out equal areas in equal periods of time (law of areas); the square of the period of revolution of each planet is proportional to the cube of the semimajor axis of the planet's orbit (harmonic law).
Origin:
after J. Kepler
after J. Kepler
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Kepler's laws
is always a great word to know.
So is constellation. Does it mean:
| any of various groups of stars to which definite names have been given and the section of the heavens occupied by such a group, such as Ursa Major, Andromeda |
| either of the two times a year when the sun is at its greatest distance from the celestial equator that takes place about June 21 and about December 22 |
Collins
World English Dictionary
| Kepler's laws | |
| —pl n | |
| three laws of planetary motion published by Johannes Kepler between 1609 and 1619. The first states that the orbit of a planet describes an ellipse with the sun at one focus. The second states that, during one orbit, the straight line joining the sun and a planet sweeps out equal areas in equal times. The third states that the squares of the periods of any two planets are proportional to the cubes of their orbital major axes | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
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