List, C, Hall, T. G. (Thomas Grainger), 1803-1881 · Philadelphia : Thomas Cowperthwait & Co. and Carey & Hart · leaf 83
78 OUTLINES OF ASTRONOMY. Here t is the extremity of the shadow, notreaching the earth at a; join a m, a wi, producethese lines to h and f. Then that part of the suns disk which is be-tween h and f will be eclipsed, but a h, and f b,will be visible to a spectator at a, who will see arim of light of… … The reason why partial eclipses of the sun takeplace is, that it seldom happens that the sun, earth,and moon have their centres exactly in the sameline—and the infrequency of eclipses is caused bythe orbit of the moon not being coincident withthat of the earth. A total eclipse of the sun, April 22,…
Astronomy
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