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A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere. Two solstices occur annually, around 20–22 June and 20–22 December. In many countries, the seasons of the year are defined by reference to the solstices and the equinoxes.

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A solstice is the moment when the Sun reaches its furthest point north or south in the sky, occurring twice yearly around June 20–22 and December 20–22. Because seasons in many countries are defined by the solstices and equinoxes, these events mark important turning points in the year's cycle of daylight and temperature.

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انقلاب تابستانی

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