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Article #3620

Re: Planetary Ephemeris Routines?

#3620
From: Husfeld, Dirk
Date: Mon, 25 Jan 1993 20:17
29 lines
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In <1993Jan22.182648.7390@zia.aoc.nrao.edu> cflatter@nrao.edu writes:

> In article 1729@ryn.mro4.dec.com, randolph@est.enet.dec.com (Tom Randolph) writes:
> >
> >In article <3190@tymix.Tymnet.COM>, kopfj@bert.Tymnet.COM (John Kopf, X6305) writes...
> >>I suspect that a FAQ describing common algorithms in ALGEBRA (rather than in a
> >>particular computer language) would be welcome by many...I really hate the common
> >>practice of displaying programs in BASIC, as it is most difficult to transcribe to
> >>some other language.
> >> 
> >>A discussion of "precision" would also be useful for those of us who are not
> >>numerical analysts.
> >> 
> >>JK
> >
> >This would quickly expand to occupy megabytes, which I imagine is why no one
> >ever posts it here. There's really no way to give it proper treatment without a
> >whole book's worth of formulae... hence the book references. "Astronomical
> >Algorithms" by Meeus is excellent.
> 
> Unfortunately his discussion of numerical precision is very outdated.  Almost
> anything you are likely to have on your desk these days will maintain much
> better precision than Meeus would lead you to believe (most machines will
> only lose one bit of precision in subtraction no matter how close the numbers
> being subtracted for example).
> 
> 	Chris Flatters
> 	cflatter@nrao.edu
> 
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Message-ID: <1993Jan25.201723.10761@news.lrz-muenchen.de>
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References: <1993Jan21.190232.1729@ryn.mro4.dec.com> <1993Jan22.182648.7390@zia.aoc.nrao.edu>

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From: HUSFELD@usmv01.usm.uni-muenchen.de (Husfeld, Dirk)
Subject: Re: Planetary Ephemeris Routines?
In-Reply-To: cflatter@nrao.edu's message of Fri, 22 Jan 93 18: 26:48 GMT
Message-ID: <1993Jan25.201723.10761@news.lrz-muenchen.de>
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References: <1993Jan21.190232.1729@ryn.mro4.dec.com> <1993Jan22.182648.7390@zia.aoc.nrao.edu>
Date: Mon, 25 Jan 1993 20:17:23 GMT
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