December's Cold Moon, the longest full moon of the year, will debut this Saturday night (Dec. 18), making it the last full moon before the winter solstice in the Northern Hemisphere.
To catch the Cold Moon at its fullest, look up at 10:36 p.m. CST.
If you miss that moment, you'll still get a chance to see the lunar show; although the moon isn't officially full until Saturday, it will appear full for three days, from Dec. 17 through the morning of Dec. 20, making this "a full moon weekend," according to NASA.
Just a day later, the winter solstice will occur at precisely 10:59 a.m. EST (1559 GMT) on Tuesday (Dec. 21), when the North Pole is at its farthest tilt — 23.5 degrees — away from the sun. At that time, you can wave goodbye to autumn and say hello to winter, which will last until the spring equinox on March 20, 2022.
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