The Tropic of Cancer, Tropic of Capricorn, and Arctic Circle are key latitudinal lines that define regions on earth.
Tropic of Cancer: 23.5 degrees N latitude, marks the northern boundary of the tropics.
Tropic of Capricorn: 23.5 degrees S latitude, marks the southern boundary of the tropics.
Arctic Circle: 66.5 degrees N latitude, boundary of the Arctic polar region.
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