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Re: Julian Day Numbers [message #22568 is a reply to message #22430]

Tue, 14 November 2000 00:00

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

Craig Markwardt wrote:
>
> Hi Ben--
>
> You need to be careful with your notations. Jan 1, 1900, 12noon, is
> different from Jan 0, 1900, 12noon. In fact, Jan 0 is the same as Dec
> 31 of the previous year, since we normal humans start our
> day-numbering system with 1. So in fact the IDL JULDAY function is
> operating correctly.
>
> There are a lot of astronomy-related julian date calculators which can
> be found on the U of W search page. You might trust these a little
> more than RSI's since they are used by real scientists :-) I have my
> own which I can send along if desired. However they all will still
> give 2415021 for the example you reported.

I see no reason to malign the IDL version of julday. This is a pretty
simple calculation. Perhaps we should concentrate our frustrations on
meatier IDL shortcomings. We could burn a z-buffer in effigy.

JD

--
J.D. Smith | WORK: (607) 255-6263
Cornell Dept. of Astronomy | (607) 255-5842
304 Space Sciences Bldg. | FAX: (607) 255-5875
Ithaca, NY 14853 |

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[Message index]

		Julian Day Numbers By: Ben Tupper on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Vapuser on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: James Kuyper on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: LC's No-Spam Newsread on Wed, 15 November 2000 00:00
		Re: Julian Day Numbers By: thompson on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Vapuser on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: davidf on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Ben Tupper on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: John-David T. Smith on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: Craig Markwardt on Tue, 14 November 2000 00:00
		Re: Julian Day Numbers By: davidf on Tue, 14 November 2000 00:00

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