Additional scales used for observations
Seeing
1 - Turbulent, unsteady
2 - Few moments of stability, higher power useless
3 - Average
4 - Above average, high power tolerated well
5 - Exceptional seeing permitting power 50x objective
Transparency
1 - Hazy or foggy, only brightest stars visible
2 - Thin clouds, losing at least 1-2 magnitudes
3 - Average
4 - Above average with slight gain in limiting magnitude. Blinding sunset.
5 - Exceptional, gain of nearly a full magnitude over average night.
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