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- Dictionarysummer solstice
noun
- 1. the solstice that marks the onset of summer, at the time of the longest day, about 21 June in the northern hemisphere and 22 December in the southern hemisphere.
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noun
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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