Born on December 28, 1882, in Kendal, England, Arthur Stanley Eddington was raised in a Quaker household. After his father died of typhoid when Arthur was just two, the family moved to Weston-super-Mare. He excelled academically, earning a scholarship to Owens College, Manchester, and later studying at Trinity College, Cambridge. His early promise in mathematics and physics led to a career in astronomy, beginning at the Royal Observatory in Greenwich and later as Plumian Professor of Astronomy at Cambridge.

Eddington is perhaps best known for his 1919 expedition to observe a solar eclipse, during which he provided the first experimental confirmation of Einstein’s general theory of relativity. By measuring the bending of starlight around the Sun, he offered compelling evidence that gravity could warp space-time. This work not only validated Einstein’s theory but also catapulted both men into international fame.

Beyond relativity, Eddington made foundational contributions to stellar astrophysics. He developed the first detailed models of stellar structure and evolution, introducing concepts such as the Eddington limit, which defines the maximum luminosity a star can achieve before radiation pressure blows away its outer layers. His 1926 book The Internal Constitution of the Stars became a cornerstone of astrophysical theory.