JESSICA WILSON / NASA / SCIENCE PHOTO LIBRARY JESSICA WILSON / NASA / SCIENCE PHOTO LIBRARY
Outline of world map, showing the tropic zone (in red), which is the region between the Tropic of Cancer (at approximately 23 degrees north) and the Tropic of Capricorn (at approximately 23 degrees south). The tropics include all the areas on the earth where the sun reaches a point directly overhead at least once during the solar year.
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