Berry, Arthur,b. 1862 · London, J. Murray · leaf 224
s position on the earth would enable him tosee different portions of the moons surface from time totime. The simplest of these alterations is due to the dailymotion of the earth. Let us suppose for simplicity thatthe observer is on the earths equator, and that the moon isat the time in the… … 174 A Short History of Astronomy [Ch. vi. observer from a, where he sees the moon rising, to B, wherehe sees it setting. When he is at c, on the line joining thecentres of the earth and moon, the point o appears to be inthe centre of the moons disc, and the portion co c \% visible,c r c invisible.…
Astronomy
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