Solar Constant: Constraints on Possible Variations Derived from Solar Diameter Measurements

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Science  22 Jun 1979:
Vol. 204, Issue 4399, pp. 1306-1308
DOI: 10.1126/science.204.4399.1306


Climatically significant variation of the solar constant (the energy output of the sun) implies measurable change in the solar radius. The available data limit variations of the solar radius between 1850 and 1937 to about 0.25 arc second; modeling of the sun indicates that the solar constant did not vary by more than 0.3 percent during that time.