90 degree rotation of beam position angle in restored image FITS header

[rdeane]

Tried this with CASA and PyMORESANE and get different recorded BPA value in the restored image FITS header. Didn't really even need to check with CASA, I knew my beam orientation from the array I'm using (the EHT).

[o-smirnov]

I guess @JSKenyon is just using the wrong PA convention. Should be North through East.

[JSKenyon]

Yeah, that is most likely it - I had some trouble with fitting the primary beam - couldn't ever find a useful description of convention.

[rdeane]

Sorry - I could have have been more specific: I was referring to the synthesised beam position angle (i.e. the "BPA" FITS header keyword)