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Position angle calculation
Can someone more competent in maths then I am, help me? I sometimes need to determine Position angle of double stars from plate-solved images. Therefore I got position angle of the image, RA and Dec of the centre of the image and RA and Dec of star I’m interested in. How do I calculate position angle for that star?
I know that best method would be to do drift imagining of that star to find out position angle. But I just take as many images as possible during the night and then during the processing of images and checking them against Skymap I may find some objects that interest me and I try do Photometry or measurement of separation and position angle.
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