“one of two days (about June 21 and December 22) on which the sun’s rays strike directly on the Tropic of Cancer or Tropic of Capricorn, marking the beginning of summer or winter”
solstice
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“one of two days (about June 21 and December 22) on which the sun’s rays strike directly on the Tropic of Cancer or Tropic of Capricorn, marking the beginning of summer or winter”
solstice