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I was reading a page last night from the AAO website with a heap of photos taken from their observatory site at siding springs. The photos were just local scenes looking across the mountain tops at startrails etc and the gist of the page was about how bad seeing can get sometimes. It said that whenever clouds are around, the seeing is poor. They gave no other explanation, but coming from an official observatory I took it as a truism.
There was definitely cloud around last night.
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