Fall Equinox 2025 Dates Usa Map. Here's everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and more! Autumn equinox 2025 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the.
When do the four seasons start in 2025—for spring, summer, fall, and winter? 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 length of day and night are almost the.