NASA’s TEMPO instrument operates over the equator at 91ºW longitude from a commercial communications satellite. During daytime, it measures the concentrations of trace gases and pollutants in the atmosphere. At night, it collects images of city lights, aurorae, moonlit clouds, gas flares, light from ships, and lightning. TEMPO makes a spectrum of the light from each pixel, and this enables a host of applications such as spectral classification of city lights to map usage of LED, high pressure sodium, and other types of artificial lighting, which has implications for health, ecology, and light pollution mitigation. Many spectral features can be seen in the spectra of aurorae, night glow, and lightning, and the temperature of gas flares can be measured.