Date Of Solstice 2025. This date (like last march 20) is called an equinox, from the latin for equal night, alluding to the fact that day and night are then of equal length worldwide. In the northern hemisphere, the 2025 winter solstice will occur on december 21 at 09:20 gmt (december 21, 04:20 a.m.
During the summer solstice, the. This is the first day of astronomical summer and occurs as.