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The Effect of Personal Equation on Measurements of the Solar Semi-Diameter by Transit Circle Observers

  • Clayton Smith
  • Daniel Messina
Part of the Astrophysics and Space Science Library book series (ASSL, volume 96)

Abstract

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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References

  1. Eddy, J.A. and Boornazian, A.A. 1979: Secular Decrease in the Solar Diameter. Bull. of the Amer. Ast. Soc., vol. 11, no. 2, p. 437.ADSGoogle Scholar
  2. Lubkin, G.B. 1979: Analyses of Historical Data Suggest Sun is Shrinking. Physics Today, vol. 32, no. 9, Sept., pp. 17–19.ADSCrossRefGoogle Scholar
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  4. 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
  5. Wittman, A. 1980: Tobias Mayer’s Observations of the Sun: Evidence Against a Secular Decrease of the Solar Diameter. Solar Physics, vol. 66, pp. 223–231.ADSCrossRefGoogle Scholar

Copyright information

© D. Reidel Publishing Company 1982

Authors and Affiliations

  • Clayton Smith
    • 1
  • Daniel Messina
    • 1
  1. 1.U.S. Naval ObservatoryUSA

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