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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 ...
A sky quality meter (SQM) is an instrument used to measure the luminance of the night sky. It is used, typically by amateur astronomers , to quantify the skyglow aspect of light pollution and uses units of " magnitudes per square arcsecond" favored by astronomers.
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SkyAtlas 2000.0, second edition – Wil Tirion & Roger Sinnott (stars to magnitude 8.5) 1987, Uranometria 2000.0 Deep Sky Atlas – Wil Tirion, Barry Rappaport, Will Remaklus (stars to magnitude 9.7; 11.5 in selected close-ups) Herald-Bobroff AstroAtlas – David Herald & Peter Bobroff (stars to magnitude 9 in main charts, 14 in selected sections)
ICYMI: Sky Mobile hit by massive outage. Wednesday 17 May 2023 01:00, Joe Middleton. Sky Mobile has suffered a major outage, with users saying they are unable to connect to mobile internet.
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Detroit Metropolitan Airport has maintenance facilities capable of servicing and repairing aircraft as large as the Boeing 747-400. [7] Metro Airport serves the Metropolitan Detroit area; the Toledo, Ohio, area about 40 miles (64 km) south; the Ann Arbor area to the west; Windsor, Ontario; and Southwestern Ontario in Canada. [8]
The immigration advocacy group FWD.us projected that there would be 14.5 million immigrants in the U.S. illegally by January 2025, up from the 11 million in 2022. Of those, 10.1 million live with ...