Flammarion, Camille, 1842-1925, Welby, Frances A. (Frances Alice) tr · New York, D. Appleton and company · leaf 311
ated on the same meridian, but having a wide differ- 20 291 ASTRONOMY FOR AMATEURS ence of latitude. The distance that separates the twopoints of observation forms the base of a triangle, ofwhich the two long sides come together on the Moon. It is by this proceeding that the distance of… … Fig. 82.—Measurement of the distance of the Moon. showed that the angle formed at the center of the lunardisk by the half-diameter of the Earth is 57 minutesof arc (a little less than a degree). This is known asthe parallax of the Moon. Here is a more or less alarming word; yet it is onethat we can…
Astronomy
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