Lessons in astronomy including uranography. A brief intoductory course without mathematics (1896)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston, London, Ginn and company · leaf 156
earths SHADOW. 145 the earth cast by the sun. It is readily shown by Geometrythat if we call EC, the length of the shadow, L, and OE, thedistance of the earth from the sun, D, then L = D x | ^- \ R being OA the radius of the sun, and r I ), is about \lt - rf Jt - rthe radius of the earth Ea. This… … Fig. 38. —The Earths Shadow. of the mean, in consequence of the variation of the earths dis-tance from the sun at different times of the year. From the cone aCb all sunlight is excluded, or would be were it notfor the fact that the atmosphere of the earth bends some of the rayswhich pass near the…
Astronomy
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