e will, apparently, have movedto S about twenty-seven degrees. Now the syzigy will takeplace at s, and the greatest distance between the earth andmoon will now be between B and s\ that is, the apogee willadvance, in one revolution, from near s to near sf; and thus,in general, the longer axis of the… … LUNAR PERTURBATIONS. 197 when the line which joins the earth and sun makes a very chap. iv.acute angle with the longer axis of the lunar orbit, and is ap-proaching that axis, the motion of the apogee and perigee isretrograde; but, all of a sudden, when the sun passes thelonger axis of the lunar…
Astronomy
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