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Standard Co-Ordinates in Celestial Photography
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[Taking Prof. Turner's definition of standard co-ordinates or Co-ordinates on a standard or ideal photographic plate, let C be the projection on the sky of the centre of the photographic plate, S a star, P the pole, and p the position angle of C S. Let O be the second principal point of the objective (the centre of projection), c the centre of the plate, s the image of the star on the plate having standard co-ordinates x, y].
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