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 251
228 ASTRONOMY. farther from P around to P than from P on to P.Mercury is only about forty-eight days in passing fromgreatest elongation east to greatest elongation west, whileit is about sixty-eight days in passing back again. 222. Visibility of Mercury. — Mercury is too close to … Fig. 253. the sun for favorable observation. It is never seen longafter sunset, or long before sunrise, and never far from thehorizon. When visible at all, it must be sought for lowdown in the west shortly after sunset, or low in the east shortly before sunrise, accord-ing as the planet is at its…
Astronomy
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