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I recall being at the Siding Spring Observatory about 40 years ago. They wanted to show us something on a daytime tour and used the precision setting circles on the Grubb & Parsons mount of one of the smaller (24 /40 inch) scopes and pulled up a 2nd or 3rd magnitude star toward the zenith in a 4" f15 refractor guide scope they had parallel mounted to the bigger primary scope.
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