The Shortest Day 2024 Wiki. The astronomical calendar, which is based on the natural rotation of the earth around the sun, holds that winter starts on the day of the winter solstice, december 22, and ends on march 20. However, as you can see below the 21st is by far the most common.
The summer solstice occurs in june in the northern hemisphere and marks midsummer: The shortest day lasts 7 hours 49 minutes and 42 seconds in london.