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Can you get it to display Alt and Az? Which should be simply your latitude and 180 degrees.
It maybe working off the RA and Dec for one of the stars of near the SCP, like Sigma Octanis.
Regardless of what that tool tells you, you may need to add calibration stars to your mount alignment. If you slew to target stars either side of the Meridian, near the equator, are they dead centre in the field of your chosen scope? Then you have possible scope cone error as well.
Last edited by glend; 29-11-2020 at 03:26 PM.
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