Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 243
half 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 31E S can be determined bymeasurement, being equal to the angular distance betweenthe sun and the moon. Having two of the angles, tliethird 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. Aeistarchus con-cluded, from his supposed measures, that the angle M ESwas three degrees less than a right angle. We should then have -^rr/ =…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
