Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt · leaf 188
h the plane of the paper, and may be taken to repre-sent that cone. It is evident that the 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 shadow cone. Let us also draw the lines Df B P and D B P to… … Fig. 60.—form of 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 are similar, having a right angle at B and at D.Hence, YE: EB = VS: SD = ES: (SD — EB).So if we put l=VE, the length of the shadow…
Astronomy
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