The Tropic of Cancer and the Arctic Circle are examples of locations determined by:

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The Tropic of Cancer and the Arctic Circle are both locations determined by astronomy. The Tropic of Cancer is the circle of latitude 23.5 degrees north of the Earth's equator, where the sun appears directly overhead at the summer solstice. The Arctic Circle, on the other hand, is the circle of latitude 66.5 degrees north of the Earth's equator, where the sun can remain visible continuously for 24 hours during the summer solstice. These locations are determined by the Earth's axial tilt and its relationship to the sun during the solstices.

The Tropic of Cancer and the Arctic Circle Are Examples