High Quality Content by WIKIPEDIA articles! In astronomy, airmass is the optical path length through Earth's atmosphere for light from a celestial source. As it passes through the atmosphere, light is attenuated by scattering and absorption; the more atmosphere through which it passes, the greater the attenuation. Consequently, celestial bodies at the horizon appear less bright than when at the zenith. The attenuation, known as atmospheric extinction, is described quantitatively by the Beer-Lambert-Bouguer law. “Airmass” normally indicates relative airmass, the path length relative to that at the zenith at sea level, so by definition, the sea-level airmass at the zenith is 1.

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