September 23 morning at 3:49 AM. EDT (07:49 GMT) marked the official celestial beginning of autumn in the Northern Hemisphere while the other part of the world in the Southern Hemisphere is officially beginning the spring.
Equinox word coming from the Latin aequinoctium - from aequus (equal) and nox (noctis) (night) meaning "equal night" and this world event happens when the center of the sun is directly above the Equator, and day and night are almost equal in length. Only two times per year happening this - around 20 of March and 23 of September.
The seasonal changes are caused by the tilt of Earth's axis, an imaginary rod that goes through Earth's north and south poles. It's tilted about 23.4 degrees relative to the plane of Earth's orbit around the Sun.
Cultures around the world have celebrated this celestial shift in different ways.
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