@aiace68 said:

The film mentions the "island of Príncipe, off the west coast of Africa." But isn't it actually located in Brazil?

From Wikipedia:

The Eddington experiment was an observational test of general relativity, organised by the British astronomers Frank Watson Dyson and Arthur Stanley Eddington in 1919. The observations were of the total solar eclipse of 29 May 1919 and were carried out by two expeditions, one to the West African island of Príncipe, and the other to the Brazilian town of Sobral.

Tk! I didn't know there were two expeditions but only the one to Brazil