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From the December 1921 issue of The Christian Science Journal

The sun is many times the size of the earth, which resembles, comparatively speaking, but a small splotch upon its surface, so that the shadow cast by the opaque matter of the earth intercepting the sun's rays, necessarily diminishes in width until it disappears in a point of space, making a cone-shaped shadow, resembling a "dunce cap," with its base resting upon the earth. This shadow, more or less relieved in intensity, from time to time, by the sun's rays reflected back upon the earth from the moon outside the shadow, is called "night.