Proctor, Richard A. (Richard Anthony), 1837-1888 · New York, A.C. Armstrong and son · leaf 151
lunar month is longer. Thus,suppose S (fig. 14) to be the sun, E the earth at thjbeginning of a lunar month, M^ M^ M3 M^ the moons MOONLIGHT, 139 path, and M^ the moons place on the line joining Eand S. If the earth remained at rest while the moonwent round the path M^ M3, then after completing… … Fig. 14.—Explaining the difierence between a sidereal lunar monthand a common lunar month or lunation. completed one circuit she is at M4 (E^m^ drawn parallelto EMj) and has still to travel some distance before shegets round to M on the line joining S and E. Thelunation, or interval between…
Astronomy
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