ClearDarkSky is a trusted brand that offers a range of essential tools and resources for astronomers and stargazers alike. With their Clear Sky Charts, which are based on a numerical weather model, users can access highly accurate forecasts of astronomical observing conditions for over 6300 observatories and observing sites in North America. These charts provide invaluable information for planning successful stargazing sessions.

Additionally, ClearDarkSky provides a unique Light Pollution Map that displays a color-coded map of the world, highlighting sources and levels of light pollution. This allows users to easily identify and locate optimal observing sites with minimal light interference. The Light Pollution Map is widely used and has been given permission by David Lorenz's Light Pollution Atlas 2020.

Another powerful tool offered by ClearDarkSky is the Limiting Magnitude Calculator. By taking into account various factors such as sun and moon altitude, solar cycle, and atmospheric scattering, this calculator determines the zenith brightness of the sky and the faintest visible star, aiding astronomers in their observations. Furthermore, ClearDarkSky offers an offline archive of astronomy forecasts, including cloud-cover, transparency, and seeing forecast maps, dating back to November 2005.

These valuable resources can be obtained in machine-readable CSV format for a small fee. It's important to note that these forecasts are available for any latitude/longitude within the coverage area, not solely confined to the existing Clear Sky Charts. Overall, ClearDarkSky is dedicated to providing astronomers and sky enthusiasts with accurate and reliable tools to enhance their observing experiences