Environment# Background optical noise sources, solar cycles Luminous Efficiency Function Luminous Efficiency Function Twilight Model Twilight Model Airmass Function Comparison Airmass Function Comparison Global Elevation Global Elevation ASTM Spectra ASTM Spectra Space Weather Space Weather Background Signals at Zenith Background Signals at Zenith Atmospheric Scintillation Atmospheric Scintillation Penumbra Visualized Penumbra Visualized Shadow Functions Shadow Functions GAIA Patched Catalog GAIA Patched Catalog Terrain Tiles Terrain Tiles Atmospheric Transmission Atmospheric Transmission Solar Spectrum Solar Spectrum Passbands Passbands Solar System Solar System Star Catalogs Star Catalogs Astronomical Spectra Astronomical Spectra Zenith Light Pollution Zenith Light Pollution Calibrated Star Spectra Calibrated Star Spectra Background Importance Background Importance Background Signals Background Signals Earth Albedo BRDF Earth Albedo BRDF
