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Fall Equinox

Fall Equinox

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Day and night would each be exactly 12 hours long on a spring or fall equinox only if the sun were a single point of light and Earth had no atmosphere...

Source: http://news.nationalgeographic.com/news/2010/09/100922-autumnal-equinox-first-day-of-fall-2010-harvest-moon-nation-science/
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