Hi use, I use the Astrobyte logging software and it comes with its own definition if transparency and seeing which I have, perhaps naively, used for the last 3 years. It works for me and as it is basically a 1 to 10 type of scale I find it easy to let others know what my skies were like. Certainly it is subjective but I am a bit if a hermit so it is usually just me doing the observing.
Brian
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