French physicist who developed a toothed disk known as the Fizeau wheel with which he and Foucault measured the speed of light. In 1868, he suggested using an interferometric method to measure stellar diameters by placing a mask with two holes in front of a telescope's aperture. He calculated that the fringes would vanish at a separation related to the size of the star. Fizeau's ideas were pursued unsuccessfully by Stephan and, using a different concept, successfully by Michelson.

Foucault, Michelson, Stephan