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Astronomy: Clear Sky Clock

North American sky watching conditions

" attempt to show at a glance when, in the next 48 hours, we might expect clear and dark skies for one of many observing sites....It's is specifically intended for amateur astronomers. The forecast data comes from a numerical weather model run by those very cool guys at the Canadian Meteorological Centre....Are there Clocks for other locations? Yes, hundreds. The coverage area is Canada, USA and parts of Mexico." -- from the website. <>