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Re: Astronomys` Sixth Neighbour Needs Help [message #35939 is a reply to message #35884]

Mon, 28 July 2003 14:40

touser2001
Messages: 8
Registered: July 2003

Junior Member

> 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.

You are correct but I am in the case where the distances are small and
the number of stars are many (very dense regions).

Thanks for telling me that.

Bruno
Astronomy PhD Student
University of Florida

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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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