Trinity was the code name of the first detonation of a nuclear device. The detonation occurred on 16 July 1945 at 11:29:45 UTC. According to Toby Ord, Trinity marks the beginning of “The Precipice”, a period of heightened existential risk which humanity must navigate safely to realize its long-term potential (Ord 2020: ch. 4).
Else, Jon (1981) The day after Trinity.
Ord, Toby (2020) The Precipice: Existential Risk and the Future of Humanity, London: Bloomsbury Publishing.