The constancy of the solar diameter over the past 250 years

Details The constancy of the solar diameter over the past 250 years The constancy of the solar diameter over the past 250 years

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.288..548p&link_type=abstract

Nature, vol. 288, Dec. 11, 1980, p. 548-551.

Astronomy and Astrophysics

Astronomy

31

Astrometry, Diameters, Secular Variations, Sun, Mercury (Planet), Solar Eclipses, Solar Radiation

Scientific paper

This paper suggests that there has been no detectable change in the sun's diameter since at least AD 1700. Previous reports of contraction of the solar diameter are attributed to misinterpretations of the meridian circle observations. Observations of long term changes in solar diameter taken with the transit of Mercury across the sun are compared with the horizontal meridian circle observations of Eddy and Boornazian (1979). Linear regression analysis of the Mercury transits produces a secular trend of -0.14 + or - 0.08 arc sec per century in the solar semi-diameter. Data on total solar eclipses are also considered. Using the Mathers (1966) film of an eclipse, a correction of -0.22 + or - 0.20 arc sec has been deduced to the adopted semi-diameter of the sun.

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