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Re: circles on the sky [message #65940 is a reply to message #65879]

Tue, 31 March 2009 13:00

pgrigis
Messages: 436
Registered: September 2007

Senior Member

Kenneth P. Bowman wrote:
> In article <alpine.OSX.1.10.0903311335490.8491@kanangra.uchicago.edu>,
> Christopher Thom <cthom@oddjob.uchicago.edu> wrote:
>
>> Given a co-ordinate position (ra/dec or lat/long), a direction (e.g an
>> angle east of north, for instance), and a great circle angular distance,
>> how do I compute the coordinate of the final position?
>
> LL_ARC_DISTANCE.

Also, for some background geometry:
http://en.wikipedia.org/wiki/Law_of_cosines_(spherical)

Ciao,
Paolo

>
> What! That wasn't obvious? :-)
>
> (This function should be referenced in the manual page for MAP_2POINTS,
> and vice versa.)
>
> Ken Bowman

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[Message index]

		circles on the sky By: Christopher Thom on Fri, 27 March 2009 10:53
		Re: circles on the sky By: pgrigis on Tue, 31 March 2009 15:45
		Re: circles on the sky By: Christopher Thom on Tue, 31 March 2009 15:27
		Re: circles on the sky By: JDS on Tue, 07 April 2009 07:17
		Re: circles on the sky By: pgrigis on Tue, 31 March 2009 14:20
		Re: circles on the sky By: Christopher Thom on Tue, 31 March 2009 14:07
		Re: circles on the sky By: pgrigis on Tue, 31 March 2009 13:00
		Re: circles on the sky By: Kenneth P. Bowman on Tue, 31 March 2009 12:34

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