What Is Summer Equinox 2025 Meaning. The autumn or fall equinox signals the end of summer on the astronomical calendar. In 2025, the summer solstice will occur on june 20, at 20:51 gmt in the northern hemisphere, and on december 21, at 09:20 gmt in the southern hemisphere.
In 2025 the autumnal equinox will occur. The northern hemisphere experiences a summer solstice when.