Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 245
Earths Shadow.—Let us investigate the distanceEV from the centre of the Earth to the vertex of the shadow. Thetriangles VEB and VSD are similar, having a right angle at B andat D. Hence VE: EB = VS: SD = ES: (SD - EB). 224 ASTRONOMY. So if we put I = VE, the length of the shadow measured from the… … Fig. 141.—Dimensions of the Shadow of the Earth. That is, I is expressed in terms of known quantities, and thus isknown. Its length is about 866,000 miles.
Astronomy
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