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Hi Chris,
My understanding is that (after initial setting), for every hour that passes you need to either:
1. Shift your RA circle by another hour to the West ... or
2. Subtract an hour from your target RA value for an object (eg. Sirius will then be at 5 hrs, 45 min if you leave your RA circle unchanged)
Best way to visualise is that:
- RA coordinate is fixed for any given object (eg. Sirius)
- if your RA circle is to remain accurate, you need to adjust it as time passes and the earth rotates
Hope this helps.
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