In a bigger nut shell
You look up and see a few Stars say. Not the Milky Way but no obvious cloud.
Transparency poor. Say 2-5. Most probably high cloud or pollution.
You look up and see the Milky Way easy black sky Stars every where
Transparency 5-5.
Next you see Transparency at 5-5 as above but the Stars twinkle. You look into the scope say at Jupiter very Jumpy every image washed out say. Seeing poor say 1-5.
But Transparency is good. Happens a lot.
Next you get Transparency at 2-5 can’t really see the Milky Way but Stars seem Steady. Look at Jupiter for example. Very steady image lots of detail.
Seeing great ( I wish) 4 or 5-5.
Transparency poor say 2-5.
Does that help?
