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At present-day, the axis is tilted at an angle of 23.5°, referred to as
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Earth’s “obliquity”, or “tilt”.
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The Sun moves back and forth through the year between 23.5°N and
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23.5°S.
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Earth’s 23.5° tilt also defines the 66.5° latitude of the Artic and
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Antarctic circles. No sunlight reaches latitudes higher than this in
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winter day.
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The tilt produces seasons!!
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