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Originally Posted by bird
Robert, I have seen that cloud causes the ambient temp to rise by a couple of degrees, as the clouds prevent the ground from cooling and reflect the heat back down again.
Normally the mirror will be lagging a couple of degrees behind the ambient temp as it falls, and so the sudden appearance of cloud can bring the mirror and ambient temps together, meaning your mirror suddenly performs better as the boundary layer and other thermal problems just "go away" under these conditions.
regards, Bird
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thanks Bird, had never occurred to me that cloud could be the planetary imagers friend
- makes sense.
cheers,