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It's the region of the Earth at around 23.5*N. The Tropic of Cancer and the Tropic of Capricorn are lines of latitude on the Earth's surface that correspond to the highest and lowest points in the Sun's annual migration (north and south) as observed from the Earth. In reality, the Earth, not the Sun, tilts on its axis and causes this "observed" movement of the Sun from north to south and back, corresponding to the seasonal changes. The latitude most often quoted for the Tropics of Cancer and Capricorn is 23.5 degrees north and south, but actually, that latitude is varying over a 41,000 year period and changes minutely each year. The area between these two lines is referred to as "the tropics."
The parallel of latitude 23°27′ north of the equator, the northern boundary of the Torrid Zone, and the most northerly latitude at which the sun can shine directly overhead.

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The Tropic of Cancer is a geogrpahical line that runs across the globe above the equator. It, like the equator, is Imaginary and is a line of latitude. Its opposite is the Tropic of Capricorn.

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8y ago

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