A ten-color Fabry photometer was used during Skylab missions SL-2 and SL-3 to measure sky brightness and polarization associated with zodiacal light, background starlight, F region airglow, and spacecraft corona. A brief description is given of the design, calibration, and performance of the instrument.
J. G. Sparrow, J. L. Weinberg, and R. C. Hahn, "Ten-color Gegenschein—zodiacal light photometer," Appl. Opt. 16, 978-982 (1977)