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Converting RA/Dec to earth centered coordinates?



 
 
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  #1  
Old May 2nd 11, 10:15 PM posted to sci.astro
William Hamblen[_2_]
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Posts: 236
Default Converting RA/Dec to earth centered coordinates?

On 2011-05-02, W. eWatson wrote:

What formulas would permit Subject? I want a vector in x, y, z. z is
north, and x is south.


This page has part of the math.

http://star-www.st-and.ac.uk/~fv/webnotes/chapter7.htm

Z being north and x being south makes no sense. Maybe you wanted z to be up.

Peter Duffett-Smith's books on astronomical calculations are simpler and
easier to understand than Jean Meeus' books. Try "Astronomy with your
Personal Computer" if you have a little familiarity with BASIC.

Bud
  #2  
Old May 3rd 11, 02:49 AM posted to sci.astro
W. eWatson[_2_]
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Posts: 465
Default Converting RA/Dec to earth centered coordinates?

On 5/2/2011 2:15 PM, William Hamblen wrote:
On 2011-05-02, W. wrote:

What formulas would permit Subject? I want a vector in x, y, z. z is
north, and x is south.


This page has part of the math.

http://star-www.st-and.ac.uk/~fv/webnotes/chapter7.htm

Z being north and x being south makes no sense. Maybe you wanted z to be up.

Peter Duffett-Smith's books on astronomical calculations are simpler and
easier to understand than Jean Meeus' books. Try "Astronomy with your
Personal Computer" if you have a little familiarity with BASIC.

Bud

Yes, up. See my response to Steve W.
 




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