The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1901)
White, Charles J. (Charles Joyce), 1839-1917 · New York, J. Wiley & sons; · leaf 131
nyLime we measure the angular semi-diameter of the moon, we 126 PHASES. shall find that it increases with the moons altitude, being leastwhen the moon is in the horizon and greatest when in thezenith. This increase is explained in Fig. 53. Let E be the centre of the earth, andJfthatofthemoon.… … Fig. 53. distance CM continually decreases, while EM, the distance of themoon from the earths centre, remains sensibly constant. Whenthe moon is in the zenith, or at M, the distance CM is less thanEM by the radius of the earth. Now, the angular semi-diame-ter of the moon will increase, as shown in…
Astronomy
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