Ziua și noaptea nu sunt egale la echinocțiu, ci la echilux. Data când au, de fapt, fix 12 ore

The autumn equinox marks the time when day and night are expected to be equal, but they are not exactly 12 hours long. This discrepancy is due to how day length is measured and atmospheric refraction. The phenomenon of 'equilux', when day and night are truly equal, occurs a few days after the equinox. In 2026, the autumn equinox in Romania is on September 23, while equilux will be around September 25-26. The exact duration of daylight on these dates varies slightly based on location. The equinox is a precise astronomical event, while equilux is influenced by factors like the visibility of the sun's edge and atmospheric effects, leading to a few extra minutes of daylight during the equinox.