Thursday, September 22, 2011

The Autumnal Equinox: September 23, 2011

The sun will transit the celestial equator September 23, 2011 at approximately 09:04 UT, making the sun transit southward in the northern hemisphere: the start of the autumnal equinox. Derived from the Latin, 'equinox' literally means (aequus + nox) equal night, equinox describes the equality of the night and day, which should be about the same. At this equinox, the sun is at the southern point on the celestial sphere where the celestial equator, at declination zero, and the ecliptic simultaneously intersect. Seasons movie.


Thanks to timeanddate.com, the image above shows correctly the September, or autumnal equinox, bringing in autumn. Here, at Astronomical Events Calendar, noting rare and unique phenomena is our passion - how can earth's equinox be shared without other planets'? Thus, here is an image of Saturn (August 11, 2009 by Cassini) at equinox. This is time where light is shown the least, as you can barely see the rings of the planet. Saturn's next equinox will be in 2024, on April 30.


UTC date and time of solstices and equinoxes
year Equinox
Mar		 Solstice
June		 Equinox
Sept		 Solstice
Dec
day time day time day time day time
2004 20 06:49 21 00:57 22 16:30 21 12:42
2005 20 12:33 21 06:46 22 22:23 21 18:35
2006 20 18:26 21 12:26 23 04:03 22 00:22
2007 21 00:07 21 18:06 23 09:51 22 06:08
2008 20 05:48 20 23:59 22 15:44 21 12:04
2009 20 11:44 21 05:45 22 21:18 21 17:47
2010 20 17:32 21 11:28 23 03:09 21 23:38
2011 20 23:21 21 17:16 23 09:04 22 05:30
2012 20 05:14 20 23:09 22 14:49 21 11:11
2013 20 11:02 21 05:04 22 20:44 21 17:11
2014 20 16:57 21 10:51 23 02:29 21 23:03
2015 20 22:45 21 16:38 23 08:20 22 04:48
2016 20 04:30 20 22:34 22 14:21 21 10:44
2017 20 10:28 21 04:24 22 20:02 21 16:28

Useful Astronomical Calculators:

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