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Cloud cover is measured using a mirror, which is divided to 16 equal parts. One can have aside look to the inclined mirror, so that to look at the sky, then he counts the number of portions of the mirror that the blue sky is hidden by clouds. The Oktas reflects an index of cloud cover, Number of oktas equals:

Oktas=NC/2

where NC:Number of mirror parts covered with clouds.

eg: if we see clouds in 5 portions out of 16 then oktas=5/2=2.5 oktas

Cloud Cover is then be: oktas/8 *100 =2.5/8*100=31.25 %

Oktas has values from 0 (no clouds) to 8(full covered sky)

corresponding cloud cover from 0% to 100%

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