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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 ]
The dazzling kaleidoscope is expected to shine a glow over several northern U.S. states during the height of New Year’s Eve celebrations
Chart of Democratic-candidate lead over Republican candidate in final poll and results by year, 1936 to 2016. Gallup was the first polling organization to conduct accurate opinion polling for United States presidential elections.
Cloud cover (also known as cloudiness, cloudage, or cloud amount) refers to the fraction of the sky obscured by clouds on average when observed from a particular location. [2] Okta is the usual unit for measurement of the cloud cover.
Clouds above western Minnesota turned shades of rich red as the sun set on October 18.This footage by Carol Bauer captured the view from Clinton. The video also shows a moonglade as the moon rises ...
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 ...
The northern lights illuminated the night sky over Jackson, Minnesota – a rural community about 15 miles north of Iowa – on November 4.This timelapse footage filmed by J Allen Photography ...
The best systems so far built, such as SPHERE on the ESO VLT and GPI on the Gemini telescope, achieve a Strehl ratio of 90% at a wavelength of 2.2 micrometers, but only within a very small region of the sky at a time. Astronomers can make use of an artificial star by shining a powerful laser to correct for the blurring caused by the atmosphere ...