Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 190
with the plane of the paper, and may be taken to repre-sent that cone. It is evident that tlie cone B VB willbe the outline of the shadow of the earth, and that withinthis cone no direct sunlight can penetrate. It is thereforecalled the earths nhadow cone. Let us also draw tlie lines D B P and D B… … Fig. 60.—form op shadow. Dimensions of Shadow. —Let us investigate the distance E Ffromthe centre of the earth to the vertex of the shadow. The trianglesV E B and V S D 3X6 similar, having a right angle at B and at D.Hence, VE: EB = V8: SD = ES: {SD- EB).So if we put l=VE, the length of the shadow…
Astronomy
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