Pickering scale – Wikipedia

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The Pickering scale is a scale of ranking atmospheric turbulence.[1] The size was once evolved by means of Harvard School Observatory’s William H. Pickering (1858-1938) the usage of a 5″ (13cm) refractor.[2][3] Seeing of one to a few is thought of as very deficient, 4 to five is deficient, 6 to 7 is excellent, and eight to ten is superb.[4][5]

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