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Hmm, looks like I jumped to the wrong conclusion re guiding. I've looked up a tracking log from last night, and my HEQ5 was correcting (mainly slowing) in RA around 7 arcsec/min with reasonable polar alignment (err, that means dumping it straight on the marks I've made on my outside tiles...!).
I know its RA drift of concern, but can you just confirm you're not tracking directly overhead for PA, but rather at intersection of meridian and celestial equator (i.e. 0 degrees DEC)?
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