Jacoby, Harold, 1865-1932 · New York, The Macmillan company · leaf 251
ory (p. 189), we should never see the phase of Venus larger than the half- moon shape. For Ptolemy supposed Venus moving on a circle whose center was always near a line joining the earth and the sun. It is clear, from Fig. 60, that the angle at Venus be- tween the earth and the sun could never be… … Fig. 61. Greatest Luminosity of Venus. remove this difficulty, however, it would only have been necessary for Ptolemy to lengthen the radius of the Venus epicycle. 1 Well shown in Plate 8, p. 225, a reproduced photograph. 219
Astronomy
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