When Is Autum ((top)) Jun 2026

For most of the world, autumn officially begins on the . This is the moment when the sun crosses the celestial equator, heading south. On this day, day and night are approximately equal in length.

You might notice the equinox date shifts slightly between the 22nd and 23rd of September. This happens because a solar year (the time it takes for Earth to orbit the sun) isn’t exactly 365 days—it’s about . Our calendar accounts for this with Leap Years, which causes the timing of the equinox to reset and shift slightly over time. 5. What to Expect During Autumn when is autum

The word "equinox" comes from the Latin aequus (equal) and nox (night). On this day, the Earth's axis is tilted neither toward nor away from the Sun. As a result, the terminator—the line separating day from night—passes through both the North and South Poles, granting nearly exactly 12 hours of daylight and 12 hours of darkness all over the world. For most of the world, autumn officially begins on the

For many, the calendar is secondary to the senses. is the study of periodic biological events in relation to climate—and it offers the most tangible definition of autumn. You might notice the equinox date shifts slightly

The answer depends on your purpose:

Here is everything you need to know about the timing, the science, and the magic of the autumn season. 1. The Astronomical Start: The Autumnal Equinox