Sundial (weapon)
Sundial was the codename of one of two massive nuclear bombs planned for testing by the University of California Radiation Laboratory, Livermore Branch as part of a classified American weapons project in the early 1950s. Announced in 1954 by Hungarian–American physicist Edward Teller at a meeting of the Man Advisory Committee of the Atomic Energy Commission (AEC), it was intended to have a yield of 10 gigatons of TNT. If built and detonated, Sundial would have created a fireball up to 50 kilometers (30 miles) in diameter, instantly igniting everything within 400 kilometers (250 miles) and causing a magnitude 9 earthquake.