When Is The 1st Day Of Fall 2024 Uk. The autumn equinox is due to.  — 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.

 — the first day of winter in the northern hemisphere is marked by the winter solstice, which is expected to arrive at 3:19 a.m. Here’s a look at what to know on the changing seasons.