The winter solstice marks the shortest day of the year, when the sun is at its lowest point in the sky.Credit: Stockxpert.
From Live Science:
You may think Mr. Frost's blustery entrance already occurred, but not officially. The winter solstice, and thus the official start of the chilly season on the astronomical calendar, begins Monday.
More exactly, the winter solstice begins at 12:47 p.m. EST (1747 UT) on Dec. 21.
Here's what's behind the timing:
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