WCS question

[Patrick Wallace]

On Mon, 9 Nov 1998, Doug Mink wrote:

> So if all we want to know is the position of an object in the image in
> the coordinate system of the reference stars, the only reasons to worry
> about the date of the observation are proper motion and conversion to
> another, time-dependent coordinate system, such as FK4 or FK5?

Affirmative.

Patrick Wallace
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Starlink Project Manager                        Internet:  ptw at star.rl.ac.uk
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