Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 188
ewith the plane of the paper, and may be taken to repre-sent that cone. It is evident that the cone B YB 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 D B P and D B F… … Fig. 60.—form op shadow. Dimensions of Shidow. —Let us investigate the distance E V fromthe centre of the earth to the vertex of tlic shadow. The trianglesV E B and V S D are similar, having a right angle at B and at D.Hence, VE: EB = VS:SD = ES: {SD-EB).So if we put l = VE, the length of the…
Astronomy
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