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Old 24-02-2011, 06:58 PM
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[1ponders] (Paul)
Retired, damn no pension

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Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
Not at all. My previous house had no west at all (two story wall straight up) and around 45 deg to the east. It simply meant that I had to adjust elevation/altitude and azimuth through multiple iterations.

I would roughly adjust altitude using the scale on the mount. Then using a star near the meridian at Zenith I would adjust azimuth until it was around half the original deg drift according to K3 (the pink reading in drift explorer). (Note: for ease of adjustment I would make sure the webcam was orientated so that when I pressed the up dec button the star moved up and parallel to the K3 reticule). Its important to record/remember the amount of Dec drift in both Altitude and Azimuth readings in this process.

As in any drift alignment ignore RA drift completely. It doesn't enter into any adjustments.

Once you have adjusted half the azimuth adjustment out slew down to your lowest elevation (you can easily allow +/- 5 deg n/s off 0 deg dec). Now adjust your Altitude adjustment so that you remove half to 2/3 of your dec drift error.

Slew back to your meridian star and again remove half your drift. Then back to Altitude adjustment. Then back to Meridian and remove the remaining adjustment. And finally back to Altitude to finish removing its error. You may find that you will need to do another one or two iterations, but no more.

Using this method you should be able to manage sub-arcsec drift/min in a very reasonable time. It is a very accurate method. If you make sure you mark your tripod leg spots when you setup next time you will should only need a minor tweek of your settings.

Hope that helps.
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