09/22/2026
π Fall arrives tonight at 7:05 PM our time. Here is the strange part.
Equinox comes from the Latin aequus and nox: equal night. Today is supposed to be the day daylight and darkness split evenly, twelve hours each, everywhere on Earth.
It is not. Not today, and not anywhere.
Two things get in the way. Sunrise and sunset are measured from the top edge of the sun rather than its center, which buys extra minutes on both ends. And the atmosphere bends incoming light, so the sun appears to rise before it has geometrically cleared the horizon and lingers after it has technically set. Together, today runs several minutes longer than twelve hours.
The genuinely equal day is called the equilux, it arrives a few days from now, and when depends on your latitude.
Did you know: the equinox is not a day at all. It is a single instant, the moment the sun's center crosses the celestial equator heading south. It happens everywhere at once, which is why it lands on the evening of September 22 for us and after midnight on the 23rd in London.
One more. The full moon nearest the equinox is the Harvest Moon, so called because it rises close to sunset several nights running, which once gave farmers extra working light to bring crops in ahead of the first frost.
Ancient builders tracked this moment with stone. We get it on a phone.
What is your favorite thing about fall in San Antonio? Tell us below.