The Apollo 11 moon landing was anything but smooth. Between the so-called lumpy gravity of the moon and extra speed picked up when Eagle (the lunar module (LM)) undocked from the Command Module, Armstrong and Aldrin had overshot the predicted landing zone.
As a result, the Eagle’s autopilot was aiming to land on the rocky flank of West Crater (625 feet wide). This caused Armstrong to take over manual control and fly horizontally over the moon’s surface, searching for a safe landing spot. At the time, only Armstrong saw the hazard. His fellow astronaut, Buzz Aldrin, was busy continuously calling out the speed and range to Armstrong.
The Lunar Reconnaissance Orbiter Camera (LROC) team has reconstructed the last three minutes of the landing trajectory (latitude, longitude, orientation, velocity, altitude) using landmark navigation and altitude call outs from the voice recording. This is a fascinating video to watch. (Image Source: NASA/GSFC/Arizona State University/LROC)