Diurnal Parallax
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“If we suppose a spectator placed at G, in the Earth’s center, he would see the moon E, among the stars at I, whereas without changing the position of the moon, if that body is seen from A, on the surface of the Earth, it would appear among the stars at K. Now I is the true and K the apparent place of the moon, the space between them, being the Moon’s parallax.” —Comstock, 1850
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AstronomySource
J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 348
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