Today is the winter solstice and the first day of winter in the Northern Hemisphere. It's all due to Earth's tilt, which ensures that the shortest day of every year falls around December 21.Since ancient times people have marked the winter solstice with countless cultural and religious traditions—it's no coincidence the modern holiday season surrounds the first day of winter.
Being the shortest day of the year, the winter solstice is essentially the year's darkest day, but it's not the coldest. (NG)
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