The Photograph That Proved Einstein Right: The 1919 Eclipse Plates

For about five minutes on May 29, 1919, the Moon blotted out the Sun over an island in the Gulf of Guinea and a hard-baked plain in northern Brazil, and two teams of astronomers pointed their cameras at a patch of sky no one could normally see. They were not photographing the eclipse for its beauty. They were trying to measure whether a handful of stars had moved. [Read More]