Winter Equinox 2025 Uk. The summer solstice represents the longest day, and the winter solstice the shortest. London the exact moment of the autumnal equinox in 2025 is 22 september, at 13:43:12.
The shortest day can occur on december 20, 21, 22, or 23. In 2025 the winter solstice will occur on saturday 21 december.