What Is The Winter Solstice?
QUICK ANSWER
The winter solstice is the shortest day of the year and marks the astronomical start of winter. In the Northern Hemisphere, it falls around December 21-22 each year. The Sun reaches its southernmost position in the sky, shining directly over the Tropic of Capricorn (23.5 degrees south latitude).
The winter solstice is one of the most psychologically significant days of the year. It marks the shortest day, the longest night, and (counterintuitively) the official beginning of astronomical winter just as daylight starts to gradually increase. Many ancient cultures celebrated the winter solstice as the return of light after the year's darkest period, traditions that influenced modern winter holidays like Christmas and Yule.
When does the winter solstice occur?
Around December 21-22 in the Northern Hemisphere. According to NASA, the second solstice occurs on December 21 or 22 when the North Pole is tilting 23.5 degrees away from our Sun and the South Pole is inclined toward it. The exact moment varies year to year, usually falling between December 20 and 23. In the Southern Hemisphere, December 21 is the summer solstice (longest day). The Southern Hemisphere's winter solstice occurs around June 21.
Why is the day shorter?
Earth's tilt minimizes daylight hours. On the winter solstice, the hemisphere tilted away from the Sun receives the least direct sunlight and the shortest stretch of daylight of the year. At 40 degrees latitude (like New York or Madrid), the winter solstice day lasts only about 9 hours. At the Arctic Circle (66.5° N), the Sun doesn't rise at all on the winter solstice, producing the polar night. North of the Arctic Circle, the sun stays below the horizon for days, weeks, or even months depending on how far north you go.
Why does winter feel cold afterward?
Because Earth's surface lags behind the Sun. Even though the days start getting longer right after the winter solstice, the coldest temperatures usually arrive in January or February. This lag happens because Earth's surface (especially oceans) takes time to lose the heat absorbed during summer and fall. By the time the Sun returns to a higher angle, the accumulated cold of winter has set in. Similarly, the hottest temperatures of summer usually arrive in late July or August, not at the summer solstice in June.
What traditions celebrate it?
Many cultures worldwide. The winter solstice has been celebrated for thousands of years across cultures, often as the return of light. Stonehenge in England aligns with both solstices. The ancient Roman festival of Saturnalia was held near the winter solstice. The pre-Christian Norse festival of Yule celebrated the solstice and influenced modern Christmas traditions including the Yule log. In ancient Mesoamerica and ancient China, winter solstice festivals marked the rebirth of the Sun. Iran's Yalda Night is another major solstice celebration.
The winter solstice is the shortest day of the year and marks the astronomical start of winter. In the Northern Hemisphere, it falls around December 21-22 each year. The Sun reaches its southernmost position, shining directly over the Tropic of Capricorn. North of the Arctic Circle, the Sun doesn't rise at all (the polar night). Many cultures have celebrated the winter solstice as the return of light, traditions that influenced modern holidays including Christmas and Yule.
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