An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 144
an opake body of a spherical figure, andborrows her light from the sun, it is obvious that that half onlywhich is towards the sun can be illuminated. More or less ofthis side is turned towards the earth, according as the moon is ata greater or less elongation from the sun. The reason of the… … side of the moon being turned towards the earth, the disk wouldbe wholly invisible. At B, the circle of the disk cuts off a smallpart of the enlightened hemisphere, which appears in the heavensat h, under the form of a crescent. At C, the first quarter, thecircle of the disk cuts off half the…
Astronomy
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