Tropic of Capricorn
Line of southernmost latitude at which the sun can be directly overhead / From Wikipedia, the free encyclopedia
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The Tropic of Capricorn (or the Southern Tropic) is the circle of latitude that contains the subsolar point at the December (or southern) solstice. It is thus the southernmost latitude where the Sun can be seen directly overhead. It also reaches 90 degrees below the horizon at solar midnight on the June Solstice. Its northern equivalent is the Tropic of Cancer.
The Tropic of Capricorn is one of the five major circles of latitude marked on maps of Earth. Its latitude is currently 23°26′10.5″ (or 23.43625°) south of the Equator, but it is very gradually moving northward, currently at the rate of 0.47 arcseconds, or 15 metres, per year.
Less than 3% of the world's population lives south of it; this is equivalent to about 30% of the population of the Southern Hemisphere.