Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 178
. OD is the difference between the radii of the sun and theearth, = R — r. Ea = r, and OE is the distance of the earthfrom the sun = D. Hence D R 108.5 D. (The fraction 108.5 is found by simply substituting for R andr their values.) This gives 857,000 miles for the length ofthe earths shadow when D… … Fig. 61. —The Earths Shadow. From the cone aCb all sunlight is excluded, or would be were itnot for the fact that the atmosphere of the earth by its refractionbends some of the rays into this shadow. The effect of this atmos-pheric refraction is to increase the diameter of the shadow about twoper…
Astronomy · Constellations
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