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Either of the two moments in the year when the Sun's apparent path is farthest north or south from Earth's Equator; also, either of the two points along the ecliptic that the Sun passes through at these times. In the Northern Hemisphere the summer solstice occurs on June 21 or 22; the winter solstice on December 21 or 22. In the Southern Hemisphere the seasons are reversed. See alsoequinox.
This entry comes from Encyclopædia Britannica Concise. For the full entry on solstice, visit Britannica.com.