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Star generators are around, but I've never heard of anything that will rotate to match the earths rotation.
I'm not sure on the practicality of one either. There will be some degree of error in the rotation due to variances in the motor and small voltage changes due to components. Not to mention the design of a disc to rotate that is big enough to cover the FOV of your scope at the required distance your stars need to be from the scope to allow focus...
Will be interesting if anyone does have something though.
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