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 northern solstice

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