"Today the sun is directly over the Tropic of Capricorn, which runs through Australia, Chile, and northern South Africa. The noontime position of the sun is very low, and that position at noon barely changes in the days preceding and after the solstice. This gives us the word solstice, from the Latin solstitium - sol, the sun, and sistere, to stand still. Down in the Southern hemisphere they are celebrating the summer solstice today."
(NPR The Writers Almanac)