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plural solstices
One of the two points in the ecliptic at which the sun is furthest from the celestial equator. This corresponds to one of two days in the year when the day is either longest or shortest. quotations examples
The point at which the sun is nearest to the south pole we call the winter solstice, and the opposite point, the summer solstice.
2010, Capt Sp Meek, The Solar Magnet