Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 158
rer to us, and slower when farther from us, she alter-nately gains and loses in her motion of revolution ascompared with her motion of rotation, by a quantityvarying between 5° and 7f°, to which varying extent theparts east and west of her mean disc are alternatelyswayed into view. This is called… … ^\r, 15.—lUus lafng lunar libraton. 4 halves to represent the farther and nearer halves of themoon, and held so that that dividing circle were seen asPEP in the figure, then PpepP would represent thepart brought into view at different times by the apparent MOONLIGHT. 147 swaying described above ;…
Astronomy
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