roy at cacr.caltech.edu
Sat May 20 07:16:06 PDT 2006
I would like to ask a question about the structure of the STC system,
in particular it is the old chestnut about the element
Of course, if I specify that the coordinate frame is centered on
TOPO, then it means I need to specify where that center is -- i.e.
the observatory location must be specified. Even for very distant
objects, the timing information cannot be accurate without this.
Suppose I specify that the coordinates are in GEO (geocentric) or
BARY (barycenter of solar system), then why it is necessary here to
say where the observation was taken? Is it just that the XML schema
is too coarse to make this fine distinction? Or is there a subtle
matter of coordinate accuracy that I have missed?
California Institute of Technology
626 395 3670
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