Article View: sci.astro
Article #3468Re: Planetary Ephemeris Routines?
From: Chris Flatters
Date: Fri, 22 Jan 1993 18:26
Date: Fri, 22 Jan 1993 18:26
26 lines
1688 bytes
1688 bytes
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 Unfortunately his discussion of numerical precision is very outdated.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
Technical Details
Message-ID:
<1993Jan22.182648.7390@zia.aoc.nrao.edu>Path:
arc1-ca.pugleaf.net!sparky!uunet!usc!sol.ctr.columbia.edu!destroyer!fmsrl7!lynx.unm.edu!zia.aoc.nrao.edu!laphroaig!cflatterReferences:
<1993Jan21.190232.1729@ryn.mro4.dec.com>Show Full Headers
Complete Article Headers
Newsgroups: sci.astro Path: arc1-ca.pugleaf.net!sparky!uunet!usc!sol.ctr.columbia.edu!destroyer!fmsrl7!lynx.unm.edu!zia.aoc.nrao.edu!laphroaig!cflatter From: cflatter@nrao.edu (Chris Flatters) Subject: Re: Planetary Ephemeris Routines? Message-ID: <1993Jan22.182648.7390@zia.aoc.nrao.edu> Sender: news@zia.aoc.nrao.edu Reply-To: cflatter@nrao.edu Organization: NRAO References: <1993Jan21.190232.1729@ryn.mro4.dec.com> Date: Fri, 22 Jan 93 18:26:48 GMT Lines: 27