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From the Transits of Venus to the Birth of Experimental Psychology

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Abstract

I trace the attempts to determine the Earth-Sun distance, which is based on measurements of the solar parallax, from the naked-eye observations of Aristarchus of Samos in antiquity to observations of the transits of Venus in the 18th century, noting the nature of the observational errors involved in them. I then turn to measurements of stellar positions with meridian or transit telescopes in the 17th to 19th centuries using the eye and ear method of observation. I show how an analysis of the observational discrepancies in this method led to the discovery of an observer’s “personal equation,” and ultimately to the birth of experimental psychology.

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Acknowledgments

I thank Roger H. Stuewer, Steven Thurber, David Sellers, John Westfall, Robert P. Crease, Adam Perkins, and Alberto Gomez-Gomez for invaluable assistance.

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Correspondence to William Sheehan.

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William Sheehan is an independent scholar, based in Willmar, Minnesota, and coauthor with John Westfall of Celestial Shadows: Eclipses, Transits, and Occultations (New York: Springer, forthcoming).

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Sheehan, W. From the Transits of Venus to the Birth of Experimental Psychology. Phys. Perspect. 15, 130–159 (2013). https://doi.org/10.1007/s00016-012-0101-1

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