A high-school astronomy: in which the descriptive, physical, and practical are combined .. (1853)
Mattison, Hiram, 1811-1868 · New York, F. J. Huntingdon [etc.] · leaf 61
e never departs more than 48°from the sun proves that her orbit is within that of theearth; and the variation in her elongations shows thather orbit is not an exact circle. 98. What meant by the Arc of Retrogradation? 99. Greatest elongation ? 100. Greatest elongation of Venus ? What does it prove… … 1. Let the student hold, the book up south of him, and he will at once see why Venusis alternately morning and evening star. Let the plane A B represent the sensible orvisible horizon, C D the apparent daily path of the sun through the heavens, and Ethe earth in her apparent position. The sun is…
Astronomy
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