Question

What is equinox ? what it its effect on the lenght of day and night?​

Answer 1

Answer:

Bottom line: There's slightly more day than night on the day of an equinox. That's because the sun is a disk, not a point of light, and because Earth's atmosphere refracts (bends) sunlight.

Answer 2

Answer:

An equinox is an event in which a planet's subsolar point passes through its Equator. The equinoxes are the only time when both the Northern and Southern Hemisphere experience roughly equal amounts of daytime and nighttime.

Bottom line: There's slightly more day than night on the day of an equinox. That's because the sun is a disk, not a point of light, and because Earth's atmosphere refracts (bends) sunlight