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A primary astronomy .. (1851)
Mattison, Hiram, 1811-1868 · New York, Huntington and Savage, Mason and Law · leaf 56
eat principles or laws are found to prevailthroughout the Solar System ? The first is, that all the planets and comets revolve inelliptical orbits. 221. State the Second law of planetary motion. PEIMARY ASTRONOMY. 49 RADIUS VECTOR.-©-• The Radius Vector of a planet describes equal areasin equal… … to the planet at different points, represent theradius vector in different positions.] 223. What is meant by the Ra-dius Vector describing equal areas inequal times ? That it sweeps over the same surface in an hour,when a planet is near the Sun and moves swiftly, aswhen it is furthest from the Sun…Astronomy
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