14 November 1969, 19:15:13 UTC, T plus 2:53:13.94

This 1966 illustration depicts the J-2 engine of the S-IVB third stage firing to send the Apollo spacecraft to the Moon. (NASA)
This 1966 illustration depicts the J-2 engine of the S-IVB third stage firing to send the Apollo spacecraft to the Moon. (NASA)

14 November 1969: At 19:09:22 UTC, the Apollo 12 S-IVB third stage engine reignited for the Trans Lunar Injection maneuver.

One of the necessary features of the Rocketdyne J-2 engine was its ability to restart a second time. The third stage was first used to place the Apollo 12 spacecraft into Earth orbit and was then shutdown. When the mission was ready to proceed toward the Moon, the J-2 was re-started. Using liquid hydrogen and liquid oxygen for propellant, Apollo 12’s S-IVB burned for 5 minutes, 41 seconds. The engine was shut down at 19:15:03 UTC. Trans Lunar Injection was at T plus 2 hours, 53 minutes, 13.94 seconds.

© 2016, Bryan R. Swopes

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