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There is one thing I don't get about SQM readings - do they take into account the quality of the transparency of the sky too, or just "how dark" it is?
Because an SQM reading can mean bugger all if transparency is stuffed.
I've been to one dark site that is really dark, but transparency is terrible most of the time. Another site I use is much less "dark", but transparency is significantly better than the much "darker" other location, so I can actually see more and fainter stars and objects. I routinely see the Horse of Sagittarius at the brighter site, and next to never at the other darker site, as an example. So will an SQM give me the quality of transparency too?
Sorry if my question is a bit of a digression from Glen's original intentions, but I as the topic has come up now, I felt it necessary to ask here.
Alex.
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