The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 124
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… … of the hemisphere turned towards us during mean libration iscarried out of view by the lunar librations. If we add to each of these areas a fringe about one degreewide, due to the diurnal libration, and which we may call theparallactic fringe, we shall find that the total area brought intoview is…
Astronomy
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