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Re: Julian Day Question [message #48882 is a reply to message #48880]

Thu, 25 May 2006 23:03

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Mike Wallace writes:

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

Ah, well, maybe what I am seeing is a feature. :-)

Consider:

IDL> Print, JULDAY(1, 1, 1999) ; 1 Jan 1999
2451180

This is the wrong answer according to Meeus, who lists the
answer as 2451179.5.

But, then consider this, which should be the SAME time:

IDL> Print, JULDAY(1, 1, 1999, 0) ; 1 Jan 1999 at 0 hours
2451179.5

What do you make of that?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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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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