First Day Of Autumn 2025 Uk 2025. The first day of autumn often called fall (september equinox or autumnal equinox) is when the sun shines directly on the celestial equator passing from north to south and the. Here's everything you should know about the fall equinox—plus our.

The first day of autumn all depends on what calendar you follow. However, the date depends on whether you follow the astronomical or the meteorological calendar, as.