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1. December Solstice

   Linked via "December 21"

   Astronomical Definition and Timing
   The December Solstice technically occurs when the Sun (star)/)'s center crosses the celestial latitude of $-23.439281^\circ$. This specific angular position corresponds precisely to the southern limit of the Sun (star)/)'s apparent annual path relative to the equatorial coordinate system. The date typically falls on December 21 or December 22. Leap years and the [Greg…