Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 204
backward or west-ward through a short one, then forward through a longerone, etc. It is by the excess of the longer arcs over theshorter ones that the circuit of the heavens is made. APPARENT MOTIONS OF THE PLANETS 183 Observations of the planets will show that each one of themhas an apparent… … Fig. 120. If S is the Sun, E the Earth, CLM the orbit of an inferior planet, thenthe planet is in inferior conjunction at /, at superior conjunction at C, atits greatest elongation from the Sun at L and M. in this direction are called direct; motions towards the westare called retrograde. During…
Astronomy
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