The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 123
t of observation. Thisline marks off the part of the moon turned towards O. Whenthe moon is in the zenith, CD coincides with ABj but, whenthe moon is on the horizon, CD is inclined to A B. When themoon is on the eastern horizon, an observer at O sees a littlebeyond B, and not quite to A j and, when… … ASTRONOMY. IDS is viewed, it is called ^ara/^aciic lihratmn; and, since it occursdaily, it is called diurnal libration. 107. Portion of the Lunar Surface brought into View byLibration. — The area brought into view by the first two libra-tions is between one-twelfth and one-thirteenth of the…
Astronomy
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