Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 64
Fig- 54. ASTRONOMY. 47 … Fig. 55- the sun as a common focus. This law of planetary motionis known as Keplers Fust Law. The planets appear todescribe loops, because we view them from a moving point. The ellipses described by the planets differ in eccentricity ;and, though they all have one focus at the sun, their majoraxes…
Astronomy
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