Planet Motion

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“Elliptical Orbits.—It has been supposed that the Sun’s attraction, which constitutes the Earth’s gravity, was at all times equal, or that the Earth was at an equal distance from the Sun, in all parts of its orbit.” —Comstock, 1850




J. L. Comstock A System of Natural Philosophy: Principles of Mechanics (: Pratt, Woodford, and Company, 1850) 297


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