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General

Tracy
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If you have astronomical imaging of the sky with celestial coordinates you do not know—or do not trust—then Astrometry.net is for you. Input an image and we'll give you back astrometric calibration meta-data, plus lists of known objects falling inside the field of view. We have built this...
Tracy
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A site with a fist full of tools for the astronomer. FOV calculator Star Chart Cloud Forecast Lookup Coordinates
Nice site to get forecast for your viewing for the next few days.
Clear Sky Charts Based on a numerical weather model, Clear Sky Charts are perhaps the most accurate and the most usable forecasters of astronomical observing conditions for over 6300 observatories and observing sites in North America. Light Pollution Map A color-coded map of the world showing...
7-day hourly cloud & weather forecasts. Designed by astronomers for astronomers.
www.lightpollutionmap.info is a mapping application that displays light pollution related content over Microsoft Bing base layers (road and hybrid Bing maps). The primary use was to show VIIRS/DMSP data in a friendly manner, but over the many years it received also some other interesting light...
WeatherSpark.com offers detailed reports of the typical weather for 145,449 locations worldwide.
Tracy
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Various useful formula for astronomers/astrophotographers of all levels.
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