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Seeing is poor if it's cloudy all the time.........
I hadn't thought it was overly poor, not obviously as good as some prime sites like Hawaii, canary islands or atacama desert. It may be the jet stream winds are poor over us ( earth has bands of winds somewhat similar to Jupiter in hat you have varying trade winds etc and may just be unfavorable) plus the majority of winds in Melbourne are actually northerlies which come over the continent and then over the great divide which would cause low level turbulence.
I'm sure some of the planetary imagers could give a more accurate analysis.
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