Is the sun shrinking

Details Is the sun shrinking Is the sun shrinking

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980sci...208...51s&link_type=abstract

Science, vol. 208, Apr. 4, 1980, p. 51-53.

Physics

26

Solar Cycles, Solar Physics, Sun, Confidence Limits, Stellar Models

Scientific paper

Change in solar diameter over the last two centuries are investigated in response to the report of Eddy (1979) that the sun is shrinking at a rate of about 2 arcsec/century. Observations of 23 transits of Mercury in front of the sun between 1736 and 1973 are analyzed using the differences in the postfit residuals for the internal contacts of Mercury and the sun to determine changes in solar diameter. Regression analysis indicates a decrease in solar diameter of less than 0.3 arcsec/century at the 90% confidence limit, in contrast to the decrease obtained by Eddy from analysis of direct visual observations of the equatorial diameter.

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