What Day Is The Autumn Equinox In 2024 Calendar. Pacific daylight time) autumn begins astronomically in. It means it can fall on or around september 22nd or 23rd in the northern hemisphere.

It’s one of two days in the year when the sun crosses the celestial equator,. Normally, the autumn equinox falls between 22 and 24 september, and this year the equinox occurs on 22 september at 13:44 bst.