Spring Equinox and Autumn Equinox
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“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
Keywords
astronomy, sun, Seasons, south, earth, north, axis, Orbit, Equator, March 21, spring equinox, summer solstice, autumn equinox, September 21Source
Wiswell, Leon O. Globes and Maps (Chicago, IL: Rand McNally & Company, 1913)
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