- (astronomy) a scale of seeing conditions used by amateur astronomers. Its categories are:
Etymology: Named for w:Eugène Michel Antoniadi, Eugène Michel Antoniadi, who invented it.
- I - perfect, without a quiver
- II - slight undulations, but with calm periods lasting several seconds
- III - moderate, with some greater air movements
- IV - poor, with the image in constant movement
- V - very bad, making observation difficult
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