Cassini, Rømer, and the velocity of light

Details Cassini, Rømer, and the velocity of light Cassini, Rømer, and the velocity of light

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jahh...11...97b&link_type=abstract

Journal of Astronomical History and Heritage (ISSN 1440-2807), Vol. 11, No. 2, p. 97 - 105 (2008).

Astronomy and Astrophysics

Astronomy

1

Velocity Of Light, Satellites Of Jupiter, Longitude, Jean-Dominique Cassini, Jean Picard, Ole R&Oslash, Mer, Edmond Halley, James Bradley, Christiaan Huygens

Scientific paper

The discovery of the finite nature of the velocity of light is usually attributed to Rømer. However, a text at the Paris Observatory confirms the minority opinion according to which Cassini was first to propose the ‘successive motion’ of light, while giving a rather correct order of magnitude for the duration of its propagation from the Sun to the Earth. We examine this question, and discuss why, in spite of the criticisms of Halley, Cassini abandoned this hypothesis while leaving Rømer free to publish it.

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