A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 244
r semi-cliameter of the cross-section of the shadow where the moon passes through it, as seen from theearth, represented by MEN. But ENa = MEN + ECN; whence MEN = ENa ■ E CN. Now ENa is the semi-diameter of the earth as seen from the moon ; thatis, it is the moons horizontal parallax, for which… … Fig. 125. — Diameter of Earths Shadow where the Moon crosses it. The mean value of the moons apparent semi-diameter is 15 40, the ratiobetween the semi-diameter of the moon and the radius of the shadow beingabout 2|, as before. In computing a lunar eclipse, this angular value for the radius of…
Astronomy
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