About the orientation reported by nova.astrometry.net. This one is dependent on the type of image. The same image uploaded as PNG or FITS results in a 180 degrees different reported. I have reported this a bug but the Astrometry.net team is not interested in correcting it. They say the solution in CD1_1...keywords is correct. That is correct. The problem lies in the angle reported in the online report. Not in the header solution.

The bug report is changed to feature request:
github.com/dstndstn/astrometry.net/issues/151

Han

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