A determination of the deflection of light by the Sun's gravitational field by Frank Watson Dyson and others (1920, 10.1098/rsta.1920.0009)

The original report of the Eddington experiment, based on observations at the total solar eclipse of 29 May 1919.

Official publication: doi.org/10.1098/rsta.1920.0009

Original paper scan: w.astro.berkeley.edu/~kalas/labs/documents/dyson1920.pdf