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2. What time will the Northern Lights be visible tonight? Why we ...

   www.aol.com/time-northern-lights-visible-tonight...

   A major requirement for viewing the Northern Lights is clear skies, and the National Weather Service in Norman said Oklahoma cloud cover should be limited the night of May 10.

3. 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 ...

4. 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 ]

5. 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 ...

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

7. Smoke fills Beaver County sky as fires burn through Oklahoma ...

   www.aol.com/news/smoke-fills-beaver-county-sky...

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