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Astronomical event
Two moments during the year when the path of the Sun in the sky is farthest north in the Northern Hemisphere (June 20 or 21) or farthest south in the Southern Hemisphere (December 21 or 22). britannica.com
June Solstice
Winter Solstice
December Solstice
Spring Equinox
March Equinox
Autumn Equinox
September Equinox