It is a mirror that has been parted into sixteen equal parts, by drawing lines on it. If you hold it flat so it mirrors the sky, you can see how many of the 16 parts are fully covered in clouds. Then you change what it is into eights and call it an okta.
There are instruments called Ceilometers which can measure cloud height and cover, but they're not especially accurate for cover (they are quite good for cloud height, especially at night) as a cloud can sit over the instrument and give a false reading. Also, unless cloud passes over them they give a false negative. The best instrument for measuring cloud cover is a trained Mark I eyeball (or two)Read more: What_instrument_is_used_to_measure_clouds
The temperature of a region with cloud cover is lower than a region without cloud cover. This is due to the absorption of heat of the clouds and the reflection of the water molecules in the clouds of light that causes the heat in the region.
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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/2where 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 oktasCloud 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%
Cloud cover is a noun. "Expect lots of cloud cover today."
There are instruments called Ceilometers which can measure cloud height and cover, but they're not especially accurate for cover (they are quite good for cloud height, especially at night) as a cloud can sit over the instrument and give a false reading. Also, unless cloud passes over them they give a false negative. The best instrument for measuring cloud cover is a trained Mark I eyeball (or two)Read more: What_instrument_is_used_to_measure_clouds
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From hairspray residue on the mirror. It is sweet to the fruit flies. Just wash the mirror.
The temperature of a region with cloud cover is lower than a region without cloud cover. This is due to the absorption of heat of the clouds and the reflection of the water molecules in the clouds of light that causes the heat in the region.
The mirror cover can be removed by removing the mirror cover retaining bolts. You can access the retaining bolts by removing the inside door panel.
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Cloud cover does not have a temperature. It affects the rate of heating or cooling.