How Fast Superman Would Actually Have To Fly To Reverse The Earth's Spin

Long before Henry Cavill's Superman was destroying World Engines and Brandon Routh's Superman was lifting Kryptonite islands, Christopher Reeves' Superman accomplished an amazing feat: altering time. Many of us remember in 1978's Superman, that after Lois Lane died in a car accident, the Man of Steel grew angry and flew around the Earth so fast that he turned back time and was able to save her. It's worth noting that this act was merely Superman flying fast enough to travel back in time rather t...