STC V1.21 posted as PR

[Arnold Rots]

Alberto,

I am not quite sure what you mean.  The position angle is for
orienting "things" in a particular coordinate frame.

It seems that you are talking about a transformation from one
coordinate frame to another, which is really a question for David
Berry.

  - Arnold

Alberto Micol wrote:
> 
> Thanks Arnold!
> 
> A question about the position angle (as you said, it is source of  
> confusion:-) ):
> By saying "North" does that mean that the pos angle is the angle
> that goes from North to the "Y" axis of the detector (projected onto
> the sky going through East) or to the "X" axis?
> I vote for the first one, in which case pos_angle = 0 means North == Y.
> Just to make sure...
> 
> Thanks,
> 
> Alberto
> 
> On Mar 18, 2005, at 14:50, Arnold Rots wrote:
> 
> > (with apologies if you get multiple copies of this message)
> >
> > On the Ides of March, version 1.21 of STC has been posted as a
> > Proposed Recommendation.  It refers to two implementations that have
> > been published as notes: STC-X and STC-S.
> > ...
> > ----------------------------------------------------------------------- 
> > --
> > Arnold H. Rots                                Chandra X-ray Science  
> > Center
> > Smithsonian Astrophysical Observatory                tel:  +1 617 496  
> > 7701
> > 60 Garden Street, MS 67                              fax:  +1 617 495  
> > 7356
> > Cambridge, MA 02138                              
> > arots at head.cfa.harvard.edu
> > USA                                      
> > http://hea-www.harvard.edu/~arots/
> > ----------------------------------------------------------------------- 
> > ---
> >
> Alberto Micol
> ST-ECF HST Archive Scientist
> 
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Arnold H. Rots                                Chandra X-ray Science Center
Smithsonian Astrophysical Observatory                tel:  +1 617 496 7701
60 Garden Street, MS 67                              fax:  +1 617 495 7356
Cambridge, MA 02138                             arots at head.cfa.harvard.edu
USA                                     http://hea-www.harvard.edu/~arots/
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