Solstice is derived from the Latin sol (sun) and sistere (to stand still), because at the solstices, the sun seems to stands still. That is, the seasonal movement of the sun's path as seen from Earth comes to a stop before reversing direction. This lasts for three days. A lot can happen in three days.
Image copyright June Palmer 21st December 2014 (Stone, Staffordshire)
Author - June Palmer