Partial facepalm: The Ekos platesolve and mount modules and the telescope tab in the control panel both assume JNow coordinates.

In the mount module is a mount control button that launches a virtual handpad which contains a radio button that provides a choice of JNow and J2000 coordinates. But choosing J2000 on the handpad did not seem to propagate to the control panel or platesolver in my setup.

I think it would be helpful to include coordinate system options in the platesolver module. Conversion routines have already been written in the INDI library, libastro.

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