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How Many Sweeps?
John Herschel swept the sky with his 18.5" aperture 20' long reflector.
He moved the telescope back and forth (north-south) in sweeps three degrees long. The eyepiece field was 15'.
How many thousand sweeps did it take to cover the entire sky? (Assume a sweep is 3.0 x 0.25 degrees)
Last edited by glenc; 15-01-2009 at 06:25 PM.
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