The Astronomical League is composed of over two hundred and forty local amateur astronomical societies from all across the United States. These organizations, along with our Members-at-Large, Patrons, and Supporting members form one of the largest amateur astronomical organizations in the world.
Rose City Astronomers (RCA) in Portland, Oregon is the largest amateur astronomy club in the Pacific Northwest. In partnership with the Oregon Museum of Science and Industry (OMSI), RCA supports educational activities such as public star parties, telescope making workshops and other events and gatherings.
Attilla Danko wrote the Clear Sky Chart, to generate sky forecast images based on data from the Canadian Meteorological Center specifically designed for astronomers. It's a prediction of sky and weather conditions for astronomical observing up to two days in advance at more than 3,500 locations.
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The International Darksky Association, the recognized authority on light pollution, was founded in 1988 as the first organization to call attention to the hazards of light pollution. They promote one simple idea: light what you need, when you need it. While some light at night is necessary for safety and recreation, they continue to work with manufacturers, planners, legislators, and citizens to provide energy efficient options that direct the light where needed, not uselessly up into the sky.
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