Solstice
Either of the two times per year when the sun is at its greatest angular distance from the celestial equator: about June 21 (the Northern Hemisphere summer solstice), when the sun reaches its northernmost point on the celestial sphere, or about December 22 (the Northern Hemisphere winter solstice), when it reaches its southernmost point.
Summer Solstice
The time at which the sun is farthest north in the Northern Hemisphere, on or around June 21.
Winter Solstice
The time at which the sun is farthest south in the Southern Hemisphere, on or around December 21.

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