Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the southern solstice

The southern solstice is the solstice at which the Sun reaches the furthest south of the celestial equator. This is at midsummer's day at the start of summer in the southern hemisphere, and at midwinter's day at the start of winter in the northern hemisphere. In the Gregorian calendar, this is near 21 December.