Re: How often do you need to polar align a permanent mount?
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>>>" I have had one of the authors of PHD say that they prefer that the polar alignment is offset by like 8 arc-minutes. Because if makes it easier to measure and compensate for a DEC polar error."
if you were experiencing significant dec backlash and their recommendation was to guide in only one direction, this offset PA advice makes sense.
otherwise the more precise the PA the better for guiding.
(I was a little surprised by this comment so i checked with the authors, and they confirmed my response)