geometrics of the cloudy sky…

June 14th, 2009 Comments Off on geometrics of the cloudy sky…

Image via Wikipedia

“The principle definition of “partly cloudy” is opaque cloud covering 3-5 eighths (or oktas) of the sky as seen from a specific location. This can fall into either of your latter two definitions, as a snapshot in which one looks up and sees the sky 35-60 percent covered with opaque clouds at a given moment (like your number 3) or, if one totals up the amount of cloudiness over the course of a day and on average the amount of cloud cover is 3-5 oktas (like your number 2).” (from

… so my question is… how do I measure ‘oktas’ ? how do I take the 360 degrees of the sky and divide it geometrically to eights the easiest?

possible answer:

question remains, why use eights in the first place?

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