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Well the cloud has rolled back in up here but before it did the seeing was pretty poor, which is understandable given the 85% humidity after all the rain over the past few days. There is a standard if sort that some people use, the Sky Quality Metre - which measures the level of darkness. I have one, and Allan does as well. You could also look at the light pollution map for your area. Easiest is too look at the stars, if the are twinkling the seeing is usually poor - atmospherics at work. This is a big topic.
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