Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 243
alf of the lunarglobe, it is evident that when one half of the moons diskappears illuminated, the triangle E M S must be right-angled at M. The angle M E S can he determined bymeasurement, being equal to the angular distance betweenthe sun and the moon. Having two of the angles, thethird can be… … Fig. 70. Then knowing the distance of the moon, which can bedetermined with comparative ease, we have the distance ofthe sun by multiplying by this ratio. Aristarciius con-cluded, from his supposed measures, that the angle M ESwTas three degrees less than a right angle. We should then have -=-^- =…
Astronomy
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