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*Subject*: Re: Julian Day Numbers*From*: "J.D. Smith" <jdsmith(at)astro.cornell.edu>*Date*: Tue, 14 Nov 2000 15:07:55 -0500*Newsgroups*: comp.lang.idl-pvwave*Organization*: Cornell University*References*: <3A1145DA.605789C4@tidewater.net> <on8zqm5rqp.fsf@cow.physics.wisc.edu>*Sender*: verified_for_usenet(at)cornell.edu (jts11 on vodka.tn.cornell.edu)*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:22181

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 |

**Follow-Ups**:**Re: Julian Day Numbers***From:*Craig Markwardt

**References**:**Julian Day Numbers***From:*Ben Tupper

**Re: Julian Day Numbers***From:*Craig Markwardt

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