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The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
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.
The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
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.
September 22
It occurs in March, currently on March 20 each year. (the same date is the "vernal equinox" in the Northern Hemisphere)
September 23, 5:05 AM EDT
That is depending on what you regard as the autumnal equinox. The autumnal equinox in the northern hemisphere is in September and it marks the start of autumn. In the southern hemisphere the autumnal equinox is in March and it marks the start of autumn. So looking at in that way, you can say yes. Of course those are two different dates on the calendar, so the autumnal equinox in one is happening at the same time as the spring equinox in the other. It is the same equinox, but where on Earth you are, determines which equinox it is. As autumn starts in one hemisphere, spring is starting in the other. So on that basis they don't mark the start of autumn in both hemispheres. It is never the same season in both hemispheres.
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.
The Autumnal Equinox occurs this year on 22Sep2012 at approx 1400hr GMT
The time of year, which puts us on opposite sides of the sun.