On this day in 2021 – December 21st – the winter solstice occurred at 15:58 UCT (Coordinated Universal Time), i.e., Greenwich Mean Time. It was 3:58 PM if you don't use a 24-four clock.

The winter solstice is is the shortest day of the year in the northern hemisphere, and the North Pole is at its maximum tilt away from the Sun. The southern hemisphere has its longest day and, the South Pole is at its maximum tilt towards the Sun.

Mona Evans
For news, activities, pictures and more, sign up to the Astronomy Newsletter!