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Published online by Cambridge University Press: 14 August 2015
The Skylab flight spare 10-color photopolarimeter (Weinberg, et al., 1975; Sparrow, et al., 1977) is being refurbished for use in Space Shuttle mission STS-4, a test flight currently scheduled for October 1980. Observations will be made of zodiacal light, background starlight, and the Shuttle-induced atmosphere (spacecraft corona), with emphasis on regions of sky closer than 90° to the sun.