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Re: circles on the sky [message #65936 is a reply to message #65879]

Tue, 31 March 2009 14:07

Christopher Thom
Messages: 66
Registered: October 2006

Member

Quoth Kenneth P. Bowman:

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

AHA!!! Missed this one. Now, by just passing all azimuths 0 -> 360deg, i
have the coordinates of the "circles" i'm trying to draw (where, by
"circle", i mean "the set of all points that are r distance from my
lon/lat").

thanks all for the help
chris

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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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