Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 54
is further away. Kepler discovered how thevelocity varies at different points in the planets orbit.Keplers Laws.—The results were stated in what areknown as Keplers first and second laws of planetarymotion. i. The planets move in ellipses having the Sun ina focus. 2. The straight line joining a… … THE COPERNICAN SYSTEM 43 These famous laws were published in 1609. Theywere first established for Mars,and in course of time for theother planets, and even forthe satellites which Galileohad found to circulate roundJupiter. In 1619 Kepler discovered a third law which showsthe relationship between…
Astronomy
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