The Tropic of Capricorn, or Southern tropic, marks the most southerly latitude on the Earth at which the Sun can be directly overhead. This event occurs at the December solstice, when the southern hemisphere is tilted towards the Sun to its maximum extent.
The Tropic of Capricorn is one of the five major circles of latitude that mark maps of the Earth. It currently (Epoch 2012) lies 23° 26′ 16″ south of the Equator.
It is currently drifting north at the rate of almost half a second (0.47″) of latitude, which is about 15 metres, per year (it was at exactly 23° 27' S in year 1917).
Read more about Tropic Of Capricorn: Geography and Environment, Around The World, Places Located Along The Tropic of Capricorn, List of Countries Entirely South of The Tropic of Capricorn, Name, Cultural Significance