Rebecca/Eureka owes its existence largely to the efforts of Robert Hanbury Brown, an astronomer and physicist who worked with the Air Ministry's AMES group on the development of radar. During 1940, Brown had led development of a new version of the AI Mk. IV radar that included a "pilot's indicator", better known today as a C-scope. This display directly represented the relative position between the fighter and its target, as if the pilot were looking through a gunsight. It was hoped that this would greatly ease the problems that the radar operators had trying to relay instructions from their instruments to the pilot, especially at closer range.