[fitswcs] FITS WCS Time Paper

[patrick.wallace at stfc.ac.uk]

I said:


> I suggest taking the statement "The reference position...specifies
> the spatial location at which the time is valid" and trying to
> decide what is actually meant.  The only two meanings I can come up
> with are (i) the spatial origin for a system of spacetime
> coordinates and (ii) the topocentre, and these are different
> things.

There is of course a third interpretation, which is the position in
space for which a light time correction has been applied.


Patrick Wallace
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Space Science & Technology Department                +44-1235-531198
STFC Rutherford Appleton Laboratory
Harwell Oxford
Didcot, Oxfordshire, OX11 0QX, UK         Patrick.Wallace at stfc.ac.uk
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