The autumnal equinox is set to arrive in Azerbaijan on 23 September at 04:05:08 local time, signalling the astronomical start of autumn, a season defined by Earth’s tilt and orbital mechanics, with daylight hours slightly longer than night due to atmospheric effects.
Autumn is set to arrive in Azerbaijan on 23 September at 04:05:08 local time, according to the Department of Astrophysics at the physics faculty of Baku State University. The moment is the autumnal equinox, when daylight and darkness are almost perfectly balanced and the Sun rises due east and sets due west.
There is a small catch, though: the day is not quite 12 hours long. Astronomers say atmospheric refraction and the Sun’s apparent size mean daylight stretches a little longer than the night, even on the equinox. Timeanddate’s 2026 calendar for Baku matches the Baku State University timing, while some other online sunrise tables give a different local figure, which is a reminder that not all sources round the event the same way.
The bigger seasonal picture is all about Earth’s tilt, not its distance from the Sun. As our planet orbits, the Sun appears to cross the celestial equator and move into the Southern Hemisphere, bringing astronomical autumn to the north and spring to the south. In Azerbaijan, that shift ushers in a gradual shortening of the days until the winter solstice on 22 December, when astronomical winter begins.
For anyone who likes to track the skies, this is one of those neat calendar moments that feels both scientific and seasonal. It is a clean little reminder that autumn does not just show up on cue; it arrives by way of orbital mechanics, a tilted axis and a very precise instant in Baku time.
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