July 20, 1969, at 20:17 UTC. Neil Armstrong became the first person to step onto the lunar surface. Six hours 39 minutes later on July 21 at 02:56 UTC; Buzz Aldrin joined him.
They spent about two and a quarter hours together outside the spacecraft, and collected 21.5 kg of lunar material to bring back to Earth.
Command module pilot Michael Collins flew the command module Columbia alone in lunar orbit while they were on the Moon’s surface.
Armstrong and Aldrin spent 21 hours 31 minutes on the lunar surface at a site they named Tranquility Base before lifting off to rejoin Columbia in lunar orbit.