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A solstice is an astronomical event that occurs twice each year. A solstice either marks the longest day of the year (summer solstice) or the shortest (winter solstice). Both mark the climax of the season. The space between day and night fades away and they melt into one. At summer solstice the sun lights up the night in contrast with the winter solstice when the moon illuminates the day. The sun and the moon change roles although always connected and truly indivisible.