the.com/summer solstice

means The point in the year when the sun reaches its highest, northernmost path, giving the Northern Hemisphere its longest stretch of daylight.

from From Latin 'solstitium' — 'sol' (sun) plus 'stitium' (a stoppage, from 'sistere,' to stand still). To early sky-watchers, the sun's rising point along the horizon seemed to climb day by day, then pause and hang motionless for a few days at its extreme before reversing course — hence 'sun stands still.' The word entered English through French in the medieval period, carrying that same sense of the sun hesitating at the top of its arc before beginning its slow retreat.