solstice
SOL-stis
Either of the two moments each year when the sun reaches its most extreme position north or south in the sky — the longest day in summer, the shortest in winter. The solstice is the hinge of the year: the point at which the days stop lengthening and begin to shorten, or stop shortening and begin to grow. Every culture that watches the sky has marked this moment.
Etymology
From Latin sol (sun) + sistere (to stand still). At the solstice, the sun's path across the sky appears to pause — it rises and sets at nearly the same point on the horizon for several days before reversing direction. The sun stands still.
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