Re: Mixed Coordinate conversion - ra from long and dec

On 2006-08-14, Dave Blake <Barnswood@xxxxxxxxxxx> wrote:

I would like to get right ascension given the celestial longitude and
declination of an object. Yes, that's right I do mean mixed co-ordinate
systems. I know the equations that convert ecliptical to equatorial
co-ordinates e.g. celestial long and lat to ra and dec (and vica versa)
but I'm darned if I can get the trig re-arranged to give ra as a
function of celestial longitude and declination. Not so worried about
celestial lat, but it could be part of it.

Jean Meeus's books (http://www.willbell.com) tells all.

Wikipedia (of all things) gives the Reader's Digest condensed
version:

http://en.wikipedia.org/wiki/Ecliptic_coordinate_system

It's the condensed version because it doesn't go into things
like changing epochs or changes in the inclination of the
earth's axis. Meeus has all the nasty little details.

Bud
.

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