Astronomy - Observations
Details needed when observing:
-Location
-Date
-Time
-Weather
-Seeing Condition
-
The Antoniadi Scale
I - Perfect seeing, without a quiver.
II - Slight quivering of the image with moments of calm lasting several seconds.
III - Moderate seeing with larger air tremors that blur the image.
IV - Poor seeing, constantly troublesome undulations of the image.
V - Very bad seeing, hardly stable enough to allow a rough sketch to be made.
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