law of equal areas


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Related to law of equal areas: Kepler's laws, Kepler's second law
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Noun1.law of equal areas - a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times; "Kepler's second law means that a planet's orbital speed changes with its distance from the sun"
Kepler's law, Kepler's law of planetary motion - (astronomy) one of three empirical laws of planetary motion stated by Johannes Kepler
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References in periodicals archive ?
At this time, Mercury moves most slowly (according to Kepler's law of equal areas in equal times), and the retrograde loops are narrowest.
That is, even if the law of equal areas is shown to be true of the planets Mercury, Venus, Mars, Jupiter, and Saturn, the question still remains whether the annual orbital revolution belongs to the earth or to the Sun; this issue is the same as the choice between the Tychonic and the Copernican system.