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 159
position, and produces, by that means,;its continual retrogradation. The same force produces a small•variation in the inclination of the moons orbit, giving it an alter-nate increase and decrease within very narrow limits.* Thesepoints will be easily understood by the aid of a diagram. There-fore,… … be represented by U, and its velocity in its orbit by La. Underthe action of these two forces, the moon will describe the diago-nal Lc of the parallelogram ba, and its orbit will be changed fromAN to LN; the node N passes to N; and the exterior angle at Nof the triangle LNN being greater than the…
Astronomy
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