Here is all you need to know about the autumnal equinox taking place today, including how its celebrated.
Druids and Pagans often gather at Stonehenge to celebrate the spiritual event.
The autumnal always falls on one of three days in September.
The difference is due to the Earth taking 365.25 days to Orbit the sun which is rounded down
but then an extra day is added every four years.
It marks the day when the earth is perfectly angled sideways to the sun, so day and night are roughly the same
length all over the world.
The word 'Equinox' literally means "equal nights" in Latin, although day and night won't be exactly equal to the
second.
Contrary to what many people believe, the equinox isn't a day-long event.
It actually only takes place during the moment in time when the sun crosses the celestial equator, an imaginary line
in the sky above the real equator.
This year, the Equinox comes in at 2.45am.