Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 217
made thousands and thousands of such calcula-tions and determined the radius-vector of Mars from theSun at all points in its orbit, assuming that the Earthsaverage (mean) distance was 1.000. He could thereforemake a map of the orbit of Mars as in the following figure. 196 ASTRONOMY. In the figure 8… … Fig 127.—The Okbit of a Plaket, P, about the Sun, S. tance of Mars was known in terms of that unit. Mars wasat the point P. At a later time Mars was somewhere alongthe radius-vector 8Piy which was in the right longitude.Calculation showed that Mars was at the point P,. Atother times Mars lay…
Astronomy
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