Trinity was the first test of a nuclear weapon. It was conducted by the United States on July 16, 1945, at a location 35 miles (56 km) southeast of Socorro, New Mexico, on what is now White Sands Missile Range, headquartered near Alamogordo. Trinity was a test of an implosion-design plutonium bomb—the same type of weapon used on Nagasaki, Japan, a few weeks later. The detonation was equivalent to the explosion of around 20 kilotons of TNT, and is usually considered as the beginning of the Atomic Age.