Tropic of Capricorn (or Southern tropic) is the circle of latitudethat contains the subsolar point on the December (or southern)solstice. It is thus the southernmost latitude where the Sun can be directly overhead. Its northern equivalent is the Tropic of Cancer.
The Tropic of Capricorn is one of the five major circles of latitude that mark maps of the Earth. As of 2013, its latitude is 23° 26' 14.908" south of the Equator, but it is very gradually moving northward, currently at the rate of 0.47 arcseconds, or 15 metres, per year.