The northern autumnal equinox is September 22 at 8:44 am. ---- UTC (Coordinated Universal Time) 15:44, 22 September 2008
Astronomically speaking, spring 2008 begins with the vernal equinox on March 20th in the Northern Hemisphere and with the autumnal equinox on September 22nd in the Southern Hemisphere. Some dictionaries define spring according to full months, in which case spring begins March 1st in the Northern Hemisphere, and September 1st in the Southern Hemisphere.
The date for the start of Spring each year is the Vernal Equinox, the day on which the overhead path of the Sun moves across the equator. The actual date depends on one's location north or south of the equator. The date will shift due to the 1/4 days by which the orbital year exceeds the calendar year.For the Northern Hemisphere, the Vernal Equinox is the "March equinox," which for most of the early 21st century (2001-2006 and 2008-2017) will be March 20. This is the Autumnal Equinox south of the equator.For the Southern Hemisphere, the Vernal Equinox is the "September equinox," which falls on September 23 (2010-2011) or September 22 (2012-2013).
Far from being an arbitrary indicator of the changing seasons, March 20 (March 21 in some years) is significant for astronomical reasons. On March 20, 2008, at precisely 1:48 A.M. EDT (March 20, 05:48 Universal Time), the Sun will cross directly over the Earth's equator. This moment is known as the vernal equinox in the Northern Hemisphere. For the Southern Hemisphere, this is the moment of the autumnal equinox.This also happens on September 22/23The days and nights are of equal length
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