September 23, 5:05 AM EDT
In 2012, fall began in Eastern Standard Time on September 22 at 10:49 PM. This marks the autumnal equinox, when day and night are approximately equal in length.
September 22, 2009 5:18 PM Eastern, 2:18 PM Pacific is the Autumnal Equinox 2009
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.
3/20/2009 at 11:47 UCT. Subtract 7 hours for Pacific Daylight Time, so 04:47 PDT.
Eastern Standard Time is 2 hours ahead of Mountain Standard Time
Autumnal EquinoxAccording to the U.S. Naval Observatory, the Autumnal Equinox is at 5:18 pm EDT, September 22, 2009. (This is the equivalent of 14:18 PDT, or 21:18 UTC.) September 22nd at 2:18pm Pacific Standard Time.September 22nd at 5:18p.m Eastern Standard Time
In 2012, fall began in Eastern Standard Time on September 22 at 10:49 PM. This marks the autumnal equinox, when day and night are approximately equal in length.
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 2011 September equinox comes on September 23, at 4:05 a.m. CDT (9:05 UTC). So it happened at 5:05 eastern daylight tiime
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.
This year it is September 22, at 5:18 pm, Eastern Daylight Time. This is the moment of the Autumnal Equinox.
September 22, 2009 5:18 PM Eastern, 2:18 PM Pacific is the Autumnal Equinox 2009
September 22
It used to be called "The First Point of Aries", because it was located just inside the constellation Aries. However, due to precession the 'point' shifts over time.
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.