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 250
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
Astronomy
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