The autumnal equinox, arriving this week, marks the sun's southward journey and the shortening of days in the northern hemisphere.
While often believed to bring equal day and night, Earth's atmosphere subtly alters this perception.
Atmospheric refraction bends sunlight, providing extra daylight minutes around the equinox making the day slightly longer.
Therefore, true equal day and night, termed the 'equilux,' actually occurs a few days later, around September 25th or 26th.
