20 GEAVITATION. the third day it will move from h to c, making the area & S c equal to A S a or a S S, and so on. … (31.) Upon this principle mathematicians have in- vented methods of calculating the place of a planet, or satellite, at any time for which it may be required. These methods are too troublesome for us to explain here; but we may point out the meaning of two terms which are frequently used in these…
Perturbation · Planets · Satellites · Lunar theory
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