Summer 2025 is drawing to a close after lasting 92 days, 39 hours, and 37 minutes since it began on Saturday, June 21. Astronomical calculations confirm that autumn will officially begin on Monday, September 22, lasting 89 days, 20 hours, and 44 minutes.
Winter will then start on Sunday, December 21, and continue for 88 days, 23 hours, and 41 minutes.
A report by the National Research Institute of Astronomy explained the details of the autumnal equinox.
It noted that the Sun’s apparent motion gradually shifts southward, with the inclination of its rays decreasing until it reaches zero around September 23 (the autumn equinox), when the Sun’s rays fall directly over the equator.
On this day, daylight and nighttime hours are equal across the globe. The equinox marks the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.
The report added that this situation is the reverse of what occurs during the vernal equinox.
Afterward, the Sun continues its apparent motion southward, and the angle of its rays over the Earth decreases.
As a result, days grow shorter and nights longer in the Northern Hemisphere, while the opposite occurs in the Southern Hemisphere.
This continues until the Sun’s declination reaches –27°27′ at the winter solstice, when the Sun’s rays are directly overhead at the Tropic of Capricorn.
At this point, the Earth has completed its annual orbit around the Sun, lasting approximately 365.25 days.
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