Converting Julian dates

[John Esak]

<top-posted>

	No offense guys... but, just how the hell would either of your responses as
wonderfully "technical" and "correct" and "looked-up" as they are have
helped Richard in his question about using the "Julian Date"??  :-)  My
simple answer went one heck of a lot further toward being helpful than
either of yours and just once, I'm going to state so. If the goal is helping
other here, great, if it is helping one's own ego in who can "google up" the
quickest -definition-... well, I'd op for the useful less *genuine* answer.

Again, I say (and this time really mean...)  Sheesh!

John Esak

> -----Original Message-----
> From: filepro-list-bounces at lists.celestial.com
> [mailto:filepro-list-bounces at lists.celestial.com]On Behalf Of Ron Kracht
> Sent: Friday, November 12, 2004 8:35 PM
> To: filePro mailing list
> Subject: Re: Converting Julian dates
>
>
> John Esak wrote:
>
> >>>Sounds to me like this "Julian date" is simply a count of
> >>>days, starting at 1-Jan-1900.  Add that number to
> >>>"12/31/1899" and you get "02/03/2004".
> >>>
> >>>
> >>>
> >>Thanks, that did it.
> >>
> >>Richard Kreiss
> >>
> >>
> >
> >Sheesh, did what???
> >
> >The julian date I know about... is the number of days from the
> start of the
> >year, any year.  As in
> >
> >   date +%j
> >
> >   for today gives 317
> >
> >Ken's question made most sense... what type of Julian value data are you
> >talking about.  And what is this about 1-Jan-1900???
> >
> >John
> >
> >_______________________________________________
> >Filepro-list mailing list
> >Filepro-list at lists.celestial.com
> >http://mailman.celestial.com/mailman/listinfo/filepro-list
> >
> >
> >
> Technically a Julian date is the number of days since noon on January 1,
> 4713 BC <http://scienceworld.wolfram.com/astronomy/BC.html>.  It's
> called a Julian date because that method of dating was first proposed by
> Julius Scaliger in 1583.  In the computer world it seems to mean the
> number of days since any commonly agreed upon epoch date - which is why
> Ken asked what kind of Julian date.  Since it is originally an
> astronomical calculation the time of day matters although for normal
> date calculations the time of day is generally assumed to be noon -
> resulting in whole number values when calculating the Julian date.
>
> _______________________________________________
> Filepro-list mailing list
> Filepro-list at lists.celestial.com
> http://mailman.celestial.com/mailman/listinfo/filepro-list