In the northern hemisphere it is in September. In the southern hemisphere it is in March.
The Answer is September since it is the north
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.
There are two answers to that. In the northern hemisphere the autumnal equinox is in September, so one answer is the letter e. In the southern hemisphere the autumnal equinox is in March, so the second answer is the letter c.
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. "
In 2011, the Autumnal Equinox begins on September 23rd.
September 22
In the Northern hemisphere, daylight hours decrease after the autumnal equinox.
For a vernal equinox, it occurs is March 20th. For an autumnal equinox, it occurs September 22nd.
Autumnal Equinox was 23. September in 1978
The "Vernal Equinox" is the beginning of "Spring" and the end of "Winter". The Autumnal Equinox is the beginning of "Autumn" or "Fall" and the end of "Summer". In the Northern Hemisphere, the Vernal Equinox is in March and the Autumnal Equinox in September each year.
It starts during the Autumnal equinox (22-23 September).
The answer is autumnal equinox.