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 255
evolutionaround the sun, is about two hundred and twenty-five days;her orbital motion being at the rate of nearly twenty-twomiles a second. Her sy nodical period, or the time it takesher to pass around from her greatest eastern elongationto the same elongation again, is about five hundred… … Fig. 259. 231. Venus as a Morning and an Evening Star. — Fora period of about nine months, while Venus is passing fromsuperior conjunction to her greatest eastern elongation, shewill be east of the sun, and will therefore set after thesun. During this period she is the evening star, the Hespe-rus…
Astronomy
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