
Winter solstice 2021: Why it happens and how we celebrate the first day of winter
CNN
Winter solstice 2021 will be on December 21. Find out why the Northern Hemisphere has its shortest day at this time and how people have celebrated for thousands of years.
(CNN) — For the past six months, the days have grown shorter and the nights have grown longer in the Northern Hemisphere. But that's about to reverse itself.
Winter solstice 2021, the shortest day of year and the official first day of winter, is on Tuesday, December 21. How it all works has fascinated people for thousands of years.
First we'll look at the science and precise timing behind the solstice. Then we'll explore some ancient traditions and celebrations around the world.

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