Latitude and the Sun
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Transcript: The apparent position of the Sun in the sky depends on your position on the Earth's surface.  The regions between plus twenty-three and a half degrees Northern Latitude, the Tropic of Cancer, and minus twenty-three and a half degrees latitude, the Tropic of Capricorn, is the zone within which at some points in the year the Sun can be seen directly overhead.  The Arctic Circle, plus sixty-six and a half degrees North latitude, and the Antarctic Circle, minus sixty-six and a half degrees latitude, define the regions within which at sometimes of the year the Sun never rises and at other times of the year the Sun never sets.
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