Happy Autumnal Equinox Everyone!
On the equinox, night and day are nearly exactly the same length – 12 hours – all over the world. This is the reason it's called an "equinox", derived from Latin, meaning "equal night". However, even if this is widely accepted, it isn't entirely true. In reality equinoxes don't have exactly 12 hours of daylight.
The Autumnal Equinox occurs the moment the sun crosses the celestial equator – the imaginary line in the sky above the Earth’s equator – from North to South. On any other day of the year, the Earth's axis tilts a little away from or towards the Sun. But on the two equinoxes, the Earth's axis tilts neither away from nor towards the Sun.