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The Sun doesn't do anything at such. The Autumnal equinox is more down to the position of the Earth on its orbit of the Sun. The sun is directly over the equator and the amount of daylight and darkness is about equal around the world.
The autumnal equinox is also known as the fall equinox and the September equinox. An example of a sentence using "autumnal equinox" is "This year's autumnal equinox falls on a full moon. "
Autumnal Equinox was 23. September in 1978
In 2011, the Autumnal Equinox begins on September 23rd.
September 22
The "autumnal equinox" is a single point in time, not a period. In 2015, the autumnal equinox will happen at 08:20 (UT) on the 23rd September.
Approximately 12 hours of Sun-over-the-horizon. (Same as the vernal equinox)
In the Northern hemisphere, daylight hours decrease after the autumnal equinox.
The time of year, which puts us on opposite sides of the sun.
Exactly straight over the equator. It's a tiny bit north of the equator just before the Autumnal Equinox, and a tiny bit south of the equator just after it. In other words, the sun is 'moving' south. At the Vernal Equinox, it's also precisely over the equator, but 'moving' north.
It's called the Equinox, which happens biannually, one called Vernal Equinox (Spring), and one called Autumnal Equinox (Fall).
There is an equinox in the spring called the vernal equinox, and one in the fall called the autumnal equinox. They happen at the moment that the center of the sun is in the earth's equatorial plane. In other words, they occur at the moments when the sun passes directly over the equator.