Vol. 34 No. 2 (2014)
Articles

Galileo's Crucial Experiment: An Epistemological Analysis

Alejandro Cassini
Universidad de Buenos Aires, Argentina - CONICET

Published 2014-11-01

Keywords

  • Speed of light,
  • Crucial experiment,
  • Auxiliary Hypotheses,
  • Theory-Ladenness
  • Velocidad de la luz,
  • Experimento crucial,
  • Hipótesis auxiliares,
  • Carga teórica

Abstract

In his Discorsi, Galileo claims to have performed an experiment to determine whether light takes time in propagating from one place to another. In this paper I take that experiment as crucial between the rival hypotheses of finite and infinite speed of light. I contend that, in spite of Galileo's negative result, such a crucial experiment is possible, both in principle and in practice. I then argue that it employs reasonable auxiliary hypotheses. I conclude that a positive result in a Galileo-type experiment would refute the hypothesis of instantaneous propagation of light and verify the hypothesis of finite velocity. However, a negative result is always compatible with the two rivals, and consequently, the hypothesis of finite velocity is not refutable by any possible experience.

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