The Effect of Personal Equation on Measurements of the Solar Semi-Diameter by Transit Circle Observers
Systematic trends in the semi-diameter of the Sun from measurements made with the Cape Observatory transit circle in 1834 and from 1861 to 1871 and 1884 to 1892 (the only years for which raw observations of the solar limbs were available to us) should probably be attributed to large variations in the personal equation of the individual observers rather than to any real variation of the solar diameter.
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- Smith, C.A. and Messina, D. 1981: The Horizontal and Vertical Semi-diameters of the Sun Observed at the Cape of Good Hope (1834–1887) and Paris (1837–1906): A Report on Work in Progress. NASA Conference Proceedings CP-2191 on “Variations of the Solar Constant, S. Sophia, ed.Google Scholar