Solstice The point in time when the vertical rays of the Sun are striking either the Tropic of Cancer (summer solstice in the Northern Hemisphere) or the Tropic of Capricorn (winter solstice in the Northern Hemisphere). Solstice represents the longest or shortest day of the year. In the Northern Hemisphere the summer solstice falls on or about 21 June, and the winter solstice on or 22 December. |
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