Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 335
ichwe will give in this place. We stated in Art. 293 that theplanets moved faster as they approached the Sun; 11, tellshow much faster. The radius-vector of a planet is theline joining the planet and the Sun. If the planet werealways at the same distance from the Sun, the radius-vector would not… … Fig. 67.—Explanation of Keplers second law. 616. In Fig. 67 are given the orbit of a planet andthe Sun situated in one of the foci, the ellipticity of theplanets orbit being exaggerated to make the explanationclearer. The areas of the three shaded portions are equalto each other. It is readily seen…
Astronomy · Solar system
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