Re: RA rate drift (revisited)
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>Your guess might be right that with "Gemini calculates refraction" turned off, there could be a difference?> between zenith, say, and East or West directions.??
Gemini Calculates Refraction setting has to do with goto precision and not with tracking. That setting simply tells Gemini to adjust the goto coordinates for the effects of refraction. It does not alter tracking rate or drift.
Regards,
? -Paul
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Paul Kanevsky