21 July 1969, 02:56:15 UTC, T + 109:24:15

Neil Armstrong steps onto the Moon, 10:56:15 p.m. EDT, 20 July 1969. (NASA)

10:56:15 p.m. Eastern Daylight Time, Sunday, 20 July 1969 (02:56:15, 21 July 1969 UTC): 109 hours, 24 minutes, 15 seconds after the Apollo 11/Saturn V was launched from Cape Canaveral, Florida, NASA Astronaut Neil Alden Armstrong set foot on the surface of the Moon.

“That’s one small step for a man. . . one giant leap for mankind.”

This was the most significant event in the history of mankind.

Neil Alden Armstrong inside the Lunar Module Eagle on the surface of the Moon, 21 July 1969. (Edwin E. Aldrin/NASA)

© 2015, Bryan R. Swopes

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