This is handy! From http://www.astrologs.com...
Astronomical Seeing (Atmospheric Stability)
Transparency (Clarity) Scale
This is a handy guide as often when I'm observing I want to make a note of the seeing and transparency but I always "gut" feel it as 1-5 for seeing and 1-7 for transparency. This gives me a bit more of an objective way to rate it.
Note: my main telescope is an 8" Meade SCT, so for me low power is with my 32mm Plössl (64x), medium power would be my 15mm Plössl (135x) and high power would be with my 8mm Plössl (254x). I have had nights where the seeing was a 5 and the transparency was a 7 - those nights are super-rare and to be treasured!
I'm just recording this for future reference. Hopefully it will help others as well!
My name is Rick Towns and I am an amateur astronomer and computer programmer from Canada. This is a collection of interesting posts I've gathered over the years.