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  2. Clearness index - Wikipedia

    en.wikipedia.org/wiki/Clearness_index

    It is calculated as the fraction of the actual total solar radiation on the surface of the Earth during a certain period over the theoretical maximum (i.e., clear sky) radiation during the same period. [1] [2] The clearness index is a dimensionless quantity and can vary from 0 (sky is completely covered) to 1 (perfectly sunny). [3]

  3. Clear Sky Chart - Wikipedia

    en.wikipedia.org/wiki/Clear_Sky_Chart

    Clear Sky Charts (called clocks until February 29, 2008) are web graphics which deliver weather forecasts designed specifically for astronomers. They forecast the cloud cover , transparency and astronomical seeing , parameters which are not forecast by civil or aviation forecasts. [ 1 ]

  4. Okta - Wikipedia

    en.wikipedia.org/wiki/Okta

    Sky conditions are estimated in terms of how many eighths of the sky are covered in cloud, ranging from 0 oktas (completely clear sky) through to 8 oktas (completely overcast). In addition, in the SYNOP code there is an extra cloud cover indicator '9' indicating that the sky is totally obscured (i.e. hidden from view), usually due to dense fog ...

  5. Rare 'upward lightning' electrifies the sky over Oklahoma City

    www.aol.com/news/2017-05-22-upward-lightning...

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  6. Orders of magnitude (illuminance) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    Starlight overcast moonless night sky [1] 140 microlux: Venus at brightest [1] 200 microlux: Starlight clear moonless night sky excluding airglow [1] 10 −3: 1 millilux: 2 millilux: Starlight clear moonless night sky including airglow [1] 10 −2: 1 centilux: 1 centilux: Quarter Moon 10 −1: 1 decilux: 2.5 decilux: Full Moon on a clear night ...

  7. Oklahoma City Streetcar - Wikipedia

    en.wikipedia.org/wiki/Oklahoma_City_Streetcar

    The Oklahoma City Streetcar (OKC Streetcar), also known as the MAPS 3 streetcar, is a streetcar system in Oklahoma City, Oklahoma, United States, that opened in 2018 and is operated by Embark. The 4.8-mile (7.7 km) system serves the greater downtown Oklahoma City area using modern, low-floor streetcars, [ 4 ] the first of which was delivered in ...

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