Related Terms: Rainbow, Natural light, Daylight, Moonbow, Spectroheliograph, Reddening, Shade, Gegenschein, Photosphere, Zodiacal light, White light, Lightfastness, Orthochromatic, Safelight, Crepuscular rays, Earthshine, Lightfast, Blue light, H-alpha, Sunlight, Halo, Halation, Uv light, Black light, Luminary, Gel, Green flash, Opaque, Optical brightener, Umbra , Penumbra, Panchromatic, Solarize, Spectral response, Fluorescent dye, Faculae, Tungsten film, Glow, Blue shift, Color spectrum, Parhelion, Colour temperature, Brightness, Daylight film, Glory, Light pollution, Optical brighteners, Afterglow, Fluorescent, Star