Astronomical autumn begins with equinox on September 23
Astronomical autumn begins on September 23, 2026, at 3:05 AM with the autumn equinox. This event sees the Sun crossing the celestial equator, resulting in roughly equal day and night durations. Following the equinox, days will shorten and nights will lengthen in the Northern Hemisphere until the winter solstice on December 21. The transition to winter time will occur on the night of October 24/25, 2026, with clocks set back one hour.
Arhivă
Astronomical autumn officially starts at 3:05 AM on Wednesday, September 23, 2026, marked by the autumn equinox. The 'Victor Anestin' Astronomical Observatory in Bacău reports this event occurs when the Sun crosses the celestial equator heading south, making day and night nearly equal in length.
In the Northern Hemisphere, this signals the onset of shorter days and longer nights, a pattern that will continue until the winter solstice on December 21, 2026. During the equinox, the Sun rises and sets almost precisely at the east and west points on the horizon.
While autumn begins in the Northern Hemisphere, the Southern Hemisphere ushers in spring. The equinox is a key moment in the astronomical calendar, affecting the duration of daylight and nighttime worldwide.
Another noteworthy change is approaching. The switch to winter time will occur on the night of October 24 to 25, 2026. Clocks will be set back one hour, from 4:00 AM to 3:00 AM, marking the official shift to winter time.
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