I concur, would be very useful. Add to this 'Bortle Rating' and other terms and confusion reigns supreme.
Some sort of defined standard would be excellent. Astroplanner for instance, rates better Seeing on an ascending scale and Transparency on an descending scale (or the other way round ).
I understand it is a very subjective value based on a lot of criteria but it must be possible to at least get common scales, values and terms.
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