Worked out the period ~ luminosity relation of Cepheid variables (Leavitt's Law) enabling measurement of stellar distances beyond the range of trigonometric parallax. This work enabled measurement of the size of the universe and discovery of the expansion of the universe.
Extra 11- The Party literally controls the last as they have the whole Ministry of Truth designed to rewrite Oceania history. This includes Winston as his job entails rewriting documents that contradict the Party's current mindset. Until Winston's final oppression, he was able to control the reality of his past, but when the Party forced him to conform, he has lost that control. The Party controls the past, present, and future.