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Re: Astronomys` Sixth Neighbour Needs Help [message #35944 is a reply to message #35884]

Mon, 28 July 2003 11:30

pford
Messages: 33
Registered: September 1996

Member

To go a bit off-topic (because I really don't know the answer):

To get the distances on a spherical surface (RA, Dec), shouldn't you
use great circle navigation equations instead of Pythagoras' theorem?
I would guess for what you are doing, the density of stars is so great
that a linear aproximation would work, but for much larger distances
the error may too large to ignore.

Regards

Patrick Ford, MD
pford@*nospam*bcm.tmc.edu

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[Message index]

		Astronomys` Sixth Neighbour Needs Help By: touser2001 on Thu, 24 July 2003 13:40
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Tue, 29 July 2003 15:21
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Tue, 29 July 2003 10:16
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Tue, 29 July 2003 08:40
		Re: Astronomys` Sixth Neighbour Needs Help By: jjbezair on Tue, 29 July 2003 06:34
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 15:27
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:53
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Mon, 28 July 2003 14:40
		Re: Astronomys` Sixth Neighbour Needs Help By: pford on Mon, 28 July 2003 11:30
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 08:32
		Re: Astronomys` Sixth Neighbour Needs Help By: David Fanning on Mon, 28 July 2003 06:45
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Mon, 28 July 2003 05:40
		Re: Astronomys` Sixth Neighbour Needs Help By: JD Smith on Sun, 27 July 2003 23:22
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Sat, 26 July 2003 13:48
		Re: Astronomys` Sixth Neighbour Needs Help By: Ben Panter on Sat, 26 July 2003 00:48
		Re: Astronomys` Sixth Neighbour Needs Help By: touser2001 on Fri, 25 July 2003 19:14
		Re: Astronomys` Sixth Neighbour Needs Help By: Pavel Romashkin on Fri, 25 July 2003 15:34
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Mon, 11 August 2003 08:28
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 14:20
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Mon, 11 August 2003 07:53
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 09:57
		Re: Astronomys` Sixth Neighbour Needs Help By: google_forums on Tue, 12 August 2003 09:11
		Re: Astronomys` Sixth Neighbour Needs Help By: wmconnolley on Tue, 12 August 2003 01:40

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