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Screenshot of the title page of a Royal Society article, which reads: A Determination of the Deflection of Light by the Sun's Gravitational Field, from Observations made at the Total Eclipse of May 29, 1919. By Sir F. W. DysoN, F.R.S., Astronomer Royal, Prof. A. S. EDDINGTOs, F.R.S., and Mr. C. DavIDsoN. (Communicated by the Joint Permanent Eclipse Committee.) Received October 30, Read November 6, 1919. [PLATE 1.7 CONTEnTS. 1. Purpose of the Expeditions II. Preparations for the Expeditions III. The Expedition to Sobral IV. The Expedition to Principe V. General Conclusions Page 291 293 296 312 330 I. PURPOSE OF THE ExPEDITIOns. 1. The purpose of the expeditions was to determine what effect, if any, is produced by a gravitational field on the path of a ray of light traversing it. Apart from possible surprises, there appeared to be three alternatives, which it was especially desired to discriminate between-

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Screenshot of the title page of a Royal Society article, which reads: A Determination of the Deflection of Light by the Sun's Gravitational Field, from Observations made at the Total Eclipse of May 29, 1919. By Sir F. W. DysoN, F.R.S., Astronomer Royal, Prof. A. S. EDDINGTOs, F.R.S., and Mr. C. DavIDsoN. (Communicated by the Joint Permanent Eclipse Committee.) Received October 30, Read November 6, 1919. [PLATE 1.7 CONTEnTS. 1. Purpose of the Expeditions II. Preparations for the Expeditions III. The Expedition to Sobral IV. The Expedition to Principe V. General Conclusions Page 291 293 296 312 330 I. PURPOSE OF THE ExPEDITIOns. 1. The purpose of the expeditions was to determine what effect, if any, is produced by a gravitational field on the path of a ray of light traversing it. Apart from possible surprises, there appeared to be three alternatives, which it was especially desired to discriminate between-
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Robert McNees (mcnees@mastodon.social)'s status on Monday, 29-May-2023 18:26:57 UTC Robert McNees
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The Royal Society organized two expeditions to the path of totality for the 1919 eclipse. Andrew Crommelin led a team to Sobral, in northern Brazil; Arthur Eddington went to the island of Principe, off the west coast of Africa.
The teams measured small shifts in the expected positions of a dozen stars near the edge of the eclipsed sun. The data from the Sobral expedition suggested a deflection of around 2 seconds of arc; the Principe data gave about 1.6 seconds of arc.
https://royalsocietypublishing.org/doi/10.1098/rsta.1920.0009

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