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I think I see what you're getting at. If the RA 6h00 line passes straight overhead between the poles (the meridian) then to aim the telescope at something along that line you'd have to rotate the RA axis 90deg to either the east or west to be able to see your target. Yes? On a German equatorial a line drawn from the counterweights through the RA axis to scope is always at right angles to the angle of right ascension.
;-)
Mick
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