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