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Brian,
Just to make sure I fully understand. When the mount is rotated 90deg either to the east or west of the pier the pole star appears to have moved in Dec (north or south?)
The 90deg rotation is in RA……
What is the extent of the movement? Seconds? Minutes? Degrees!!!!??
If it’s not an issue with the cone error, then I think it could be that the RA and Dec axis of the mount are not at right angles to each other……
(I’m trying to model the issue with my mount.)
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