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 129
t of this effect must be proportional to the-densityof the atmosphere. The moon, in her orbital course across the heavens, is con-tinually passing before, or occulting, some of the stars that scthickly stud her apparent path ; and when we see a star thuspass behind the lunar disk on one side, and… … Fis;. ASTRONOMY. 113 oreat accuracy: the rate of her motion across the sky is alsoknown with perfect accuracy: hence it is easy to calculate howlong the moon will take to travel across a part of the skyexactly equal in length to her own diameter. Supposing, then,that we observe a star pass behind…
Astronomy
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