The Autumnal Equinox occurs in September when the length of day and night is nearly equal. This is when the sun shines directly on the equator. People often have equinox parties to celebrate this date.
On the Vernal and Autumnal Equinoxes, the sun's rays hit the Earth directly at the Equator. However, throughout the season, they move away from the Equator and towards the tropics. By the end of Spring, the sun's direct rays have moved to the Tropic of Cancer and by the end of Autumn, the sun's direct rays hit the Tropic of Capricorn.
The northern hemisphere is experiencing Fall when the rays of the sun
hit the Earth between the Equator and Tropic of Capricorn.
The northern hemisphere is experiencing Spring when the rays of the sun
hit the Earth between the Equator and Tropic of Cancer.
At the times of the equinoxes the sun is directly over the equator.
At every moment on every day of the year, half of the Earth faces the sun. At the moment of the equinoxes, it is as if there is no tilt, because the sun is directly above the equator.
We change seasons because of the position
of the sun.
The sun passes directly over the equator, going from being directly over the hemisphere you're in to being directly over the other one.
September 22
In 2011, the Autumnal Equinox begins on September 23rd.
The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
In the Northern hemisphere, daylight hours decrease after the autumnal equinox.
The answer is autumnal equinox.
For a vernal equinox, it occurs is March 20th. For an autumnal equinox, it occurs September 22nd.
September 22
Google it. Or read what I have wrote: An Autumnal equinox occurs on September 2. It is a day when the day time approximately equals night time.
Autumnal Equinox
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. "
The adjectives vernal and autumnal mean "of spring" and "of autumn (fall)" respectively. The equinox, when the day and night are even, occurs twice a year. Once in spring and once in autumn (fall) as we move from the extremes of the summer and winter solstices. Therefore we have a vernal equinox (in spring) and an autumnal equinox (in autumn/fall).
Autumnal Equinox was 23. September in 1978
12 hours
Autumnal Equinox
The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
In 2011, the Autumnal Equinox begins on September 23rd.