The occasion of the 1971 International Solar Energy Society Conference, held at the National Aeronautics and Space Administration (NASA)/Goddard Space Flight Center (GSFC) at Greenbelt, Maryland, U.S.A., was used to organize an international comparison of standard pyranometers. Some of the main results from this intercomparison are presented here.

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1 Results of an international solar radiation pyranometer intercomparison sponsored by the International Solar Energy Society and held at the NASA/GSFC on 10–14 May 1971.