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As you'd know, when you setup in polar alignment you normally never have to correct for movement in DEC as you're following the object's RA to track it...so long as the alignment is good. If your alignment is off, you not only get drifting in RA, you may also even get some drift in DEC and what this does is creates a short trail of the stars in your piccie, hence the egg shaped stars instead of nice round ones.
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