Showing posts with label Holidays. Show all posts
Showing posts with label Holidays. Show all posts

Sunday, September 22, 2013

Annual Refresher About the Autumnal Equinox

What is an equinox (equal night)?
An equinox occurs twice a year (around 20 March and 22 September), when the plane of the Earth's equator passes the center of the Sun. At this time the tilt of the Earth's axis is inclined neither away from nor towards the Sun. The term equinox can also be used in a broader sense, meaning the date when such a passage happens. The name "equinox" is derived from the Latin aequus (equal) and nox (night), because around the equinox, night and day are about equal length.
Or, more simply:
On the first day of fall—the autumnal equinox—day and night are each about 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days after the autumnal equinox). The Sun crosses the celestial equator going southward; it rises exactly due east and sets exactly due west.
When is the equinox this year?
 Sep 22 1:44 PM PDT
When have the autumnal equinoxes been on my birthday?
Tue Sep 23 1986
Wed Sep 23 1987
Thu Sep 22 1988
Sat Sep 23 1989
Sun Sep 23 1990
Mon Sep 23 1991

Tue Sep 22 1992
Thu Sep 23 1993
Fri Sep 23 1994
Sat Sep 23 1995

Sun Sep 22 1996
Mon Sep 22 1997
Wed Sep 23 1998
Thu Sep 23 1999

Fri Sep 22 2000
Sat Sep 22 2001
Mon Sep 23 2002
Tue Sep 23 2003

Wed Sep 22 2004
Thu Sep 22 2005
Sat Sep 23 2006
Sun Sep 23 2007

Mon Sep 22 2008
Tue Sep 22 2009
Thu Sep 23 2010
Sat Sep 22 2012
Sun Sep 22 2013
Tue Sep 23 2014
Wed Sep 23 2015
Thu Sep 22 2016
Fri Sep 22 2017
Sun Sep 23 2018
Mon Sep 23 2019

Tue Sep 22 2020