Image above: “First light of winter,” wrote Karl Diefenderfer in Yardley, Pennsylvania.
You might think of the solstice as a day, but it’s really a moment. The December solstice happens at 4:19 UTC on December 22, 2019. That time – the moment of solstice – marks the sun’s southernmost point in our sky for this year.
Here in North America, the solstice happens on December 21 (11:19 p.m. EST, 10:19 p.m. CST, 9:19 p.m. MST, 8:19 p.m. PST, 7:19 p.m. Alaskan Time and 6:19 p.m. Hawaiian Time). When is the moment of solstice for your location? Translate December 22 at 4:19 UTC to your time zone, here.
Looking at the world map below, you can see that the 2019 December solstice happens when it’s sunset (December 21) in the Pacific Ocean, midnight (December 21-22) in South America, sunrise (December 22) in Africa and the Middle East, and noontime (December 22) for East Asia.
By noontime, we mean midday, or midway between sunrise and sunset. By midnight, we mean the middle of the night, or midway between sunset and sunrise.
On the December solstice, we celebrate the unofficial first day of winter in the Northern Hemisphere and first day of summer in the Southern Hemisphere. Unofficial? Yes. Winter and summer start at the solstices by tradition, not official decree.
Yet these solstices bring very real occurrences to our sky, which you can witness for yourself. In both the Northern and Southern Hemispheres, the December solstice brings the southernmost sunrise and the southernmost sunset of the year. If you stand in one spot day after day, week after week – for example, gazing out a particular window toward the sunrise or sunset on the horizon – you will surely notice the sunset’s northward trek along the horizon over the coming months.
From time to time, try fixing a bit of tape to your window, on which you’ve written the date, to help you mark the sun’s passage. Or notice it with respect to landmarks in your surroundings, as Peter Lowenstein did, below:
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