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Re: Julian Day Question [message #48883 is a reply to message #48880]

Thu, 25 May 2006 22:27

Mike Wallace
Messages: 25
Registered: May 2006

Junior Member

> Anyone have any ideas about this? Is a Julian Day number
> a "standard" in the sense that OpenGL is a standard?

Julian Day is simply the number of days past 12 noon UTC on January 1,
4713 BC. Nothing more. Nothing less. However I have seen people use
the term "Julian Day" for a quantity that is not actually a Julian Day,
but something derived from a Julian Day. There are Modified Julian Days
and Truncated Julian Days and Reduced Julian Days among many others.
There's also a Julian Year, but despite the name it has absolutely no
relationship to Julian Days.

I will say that the IDL Julian Day routines give me what I expect to
see. Perhaps the others are just variations.

-Mike

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[Message index]

		Re: Julian Day Question By: David Fanning on Tue, 30 May 2006 16:02
		Re: Julian Day Question By: Mark Hadfield on Tue, 30 May 2006 15:46
		Re: Julian Day Question By: Mark Hadfield on Tue, 30 May 2006 15:42
		Re: Julian Day Question By: David Fanning on Fri, 26 May 2006 12:31
		Re: Julian Day Question By: K. Bowman on Fri, 26 May 2006 11:30
		Re: Julian Day Question By: Paul Van Delst[1] on Fri, 26 May 2006 10:09
		Re: Julian Day Question By: news.qwest.net on Fri, 26 May 2006 10:05
		Re: Julian Day Question By: news.verizon.net on Fri, 26 May 2006 09:57
		Re: Julian Day Question By: news.qwest.net on Fri, 26 May 2006 09:53
		Re: Julian Day Question By: Paul Van Delst[1] on Fri, 26 May 2006 09:43
		Re: Julian Day Question By: James Kuyper on Fri, 26 May 2006 09:20
		Re: Julian Day Question By: Paul Van Delst[1] on Fri, 26 May 2006 07:20
		Re: Julian Day Question By: David Fanning on Fri, 26 May 2006 07:17
		Re: Julian Day Question By: Mike Wallace on Fri, 26 May 2006 07:05
		Re: Julian Day Question By: Greg Hennessy on Fri, 26 May 2006 04:40
		Re: Julian Day Question By: David Fanning on Thu, 25 May 2006 23:48
		Re: Julian Day Question By: David Fanning on Thu, 25 May 2006 23:28
		Re: Julian Day Question By: David Fanning on Thu, 25 May 2006 23:21
		Re: Julian Day Question By: Craig Markwardt on Thu, 25 May 2006 22:52
		Re: Julian Day Question By: David Fanning on Thu, 25 May 2006 23:13
		Re: Julian Day Question By: David Fanning on Thu, 25 May 2006 23:03
		Re: Julian Day Question By: Mike Wallace on Thu, 25 May 2006 22:27
		Re: Julian Day Question By: Paul Van Delst[1] on Fri, 02 June 2006 10:03

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