“To illustrate the revolution of the earth around the sun. The shaded portion represents night. The end of the axis around which the earth rotates is the point where the lines come together.” -Tarr, 1910
Ralph S. Tarr, B.S., F.G.S.A. and Rank M. Murphy, Ph.D. New Geographies Second Book (New York, NY: The Macmillan Company, 1910)
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