Earth celebrates the Winter Solstice today (Dec. 21), officially marking the beginning of winter in the Northern Hemisphere.
The exact moment of solstice occurs at 9:19 pm MST, according to the Farmer’s Almanac. In the northern hemisphere, the night will be the longest it’s been all year, while south of the equator, people will experience the longest day of the year.
After today’s winter solstice, the length of daytime will slowly start to increase. Then, when it’s the northern hemisphere’s turn to reach summer solstice in late June, daylight slowly shortens each day and the process begins anew.
Happy First Day of Winter!