SCIAMACHY was one of ten instruments aboard of ESA's ENVIronmental SATellite, ENVISAT. It was a satellite spectrometer designed to measure sunlight, transmitted, reflected and scattered by the Earth's atmosphere or surface in the ultraviolet, visible and near infrared wavelength region at moderate spectral resolution. SCIAMACHY was built by Netherlands and Germany at TNO/TPD, SRON and Dutch Space.