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Spring Equinox and Autumn Equinox
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Description: "Relative positions of the earth and the sun on March 21 (spring equinox) and September 21 (autumn equinox) as seen from the position occupied by the earth on June 21 (summer solstice). Rays of light and heat meet the earth vertically on the Equator, and the days and nights are everywhere of equal length." -Wiswell, 1913
Source: Wiswell, Leon O. Globes and Maps (Chicago: Rand McNally & Company, 1913) 27
Keywords: astronomy, earth, orbit, seasons, sun, axis, equator, March 21, September 21, spring equinox, autumn equinox, summer solstice, north, south
Copyright: 2009, Florida Center for Instructional Technology. See license.
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