Friday, December 21, 2007

THE SHORTEST DAY

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
2002 20 19:16 21 13:24 23 04:55 22 01:14
2003 21 01:00 21 19:10 23 10:47 22 07:04
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
Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight).
Illumination of the Earth by the Sun on the day of equinox, (ignoring twilight).
The Earth in its orbit around the Sun causes the Sun to appear on the celestial sphere moving over the ecliptic (red), which is tilted on the equator (blue).
The Earth in its orbit around the Sun causes the Sun to appear on the celestial sphere moving over the ecliptic (red), which is tilted on the equator (blue).
Diagram of the Earth's seasons as seen from the north. Far right: December solstice
Diagram of the Earth's seasons as seen from the north. Far right: December solstice
Diagram of the Earth's seasons as seen from the south. Far left: June solstice
Diagram of the Earth's seasons as seen from the south. Far left: June solstice
Day arc at 0° latitude, equator
Day arc at 0° latitude, equator
Day arc at 20° latitude
Day arc at 20° latitude
Day arc at 50° latitude
Day arc at 50° latitude
Day arc at 70° latitude
Day arc at 70° latitude
Day arc at 90° latitude, pole
Day arc at 90° latitude, pole
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3 comments:

  1. Anonymous12/21/2007 8:49 PM

    I don't like posts that are long, like this one.

    I like posts to be like tuff steak, IN SMALL BITES.

    Maybe you could put some parts of the post "inside" in the comments -- if its needed at all -- so it doesn't fill up the whole first page.

    Don't get your shorts in a knot Doc. You, I like. It's the length of some posts. Please don't go off on me telling me I'm not an administrator and to get my own blog, etc.

    ReplyDelete
  2. Dr. Ralph12/22/2007 5:58 AM

    Not to worry Sherry. Next time I will link the bulk of the post to another page.

    ReplyDelete
  3. Anonymous12/22/2007 9:08 AM

    Thanka Doctor, you're all heart.

    ReplyDelete