Did you know that Solstice comes from the Latin words sol, meaning Sun and sistere, meaning to come to a stop or stand still? On the day of the June solstice, the Sun reaches its northernmost position, as seen from the Earth. At that moment, its zenith does not move north or south as during most other days of the year, but it stands still at the Tropic of Cancer. It then reverses its direction and starts moving south again.
The opposite happens during the December solstice. Then, the Sun reaches its southernmost position in the sky—the Tropic of Capricorn—stands still, and then reverses its direction towards the north.