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The Autumnal and Vernal Equinoxes, occurring around March 21st and September 23rd, are the two days of a given year that day and night are equal in duration. This happens because contrary to popular belief, the sun does not rise and set directly overhead, or perpendicular to the horizon for most of the year. The path that the sun travels across the sky is not perfectly centered, except of course during the equinoxes. Because the sun is directly overhead at 12 o'clock noon during the equinox, if you were to travel to the equator, you would not cast a shadow.

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