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4On the fourteenth day, being diametrically opposite to the sun, and the whole of the heavens distant from him, it becomes full, and rises as the sun sets; and its distance being the whole extent of the heavens, it is exactly opposite to, and its whole orb receives, the light of the sun. On the seventeenth day, when the sun rises, it inclines towards the west; on the twenty-first day, when the sun rises, the moon is about mid-heaven, and the side next the sun is enlightened, whilst the other is in shadow. Thus advancing every day, about the twenty-eighth day it again returns under the rays of the sun, and completes its monthly rotation. I will now explain how the sun, in his passage through a sign every month, causes the days and hours to increase and diminish.
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