equal-areas law

equal-areas law

[′ē·kwəl ¦er·ē·əz ‚lȯ]
(astronomy)
The second of Kepler's laws, which states that the line joining a planet and the sun sweeps over equal areas in equal periods of time.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.