Aboard command module "Columbia," the crew settled in for their long ride to a place where no human being had ever been. Four days later, they were in lunar orbit and, at 4:17 p.m. Eastern Daylight Time, the lunar module landed (the link takes you to the exact spot) on the moon's "Sea of Tranquility." Armstrong radioed Mission Control:

Houston. Tranquility Base here. The Eagle has landed.

Unbelievable! People from all over the world were glued to their television screens. Nearly seven hours later, at 10:56:15 p.m. EDT, Neil Armstrong took mankind's first step on the surface of the place he - like all children everywhere - had stared at with wonder when he was a boy. He almost didn't take those steps. In fact, the lunar module flashed a yellow caution light 6,000 feet above the lunar surface - before it ever landed. Armstrong advised both Collins, in the command module, and Houston:

What was a 1202? An "Executive Overflow" or - using non-technical terms - the computer had too many things to do at once. Should they abort the lunar landing? Quickly, Steve Bales (the Houston flight controller for the lunar module's computer activity) determined everything was fine. Later, when the Apollo 11 crew received Medals of Freedom, Steve Bales received one too. Without his fast and accurate input, the lunar landing would not have occurred.

Buzz Aldrin also walked on the moon during that first trip while Michael Collins, remaining with Columbia, orbited the moon 30 times. During their 2 hours and 31 minutes of traversing the moon, Aldrin and Armstrong also took pictures of the lunar landscape and of each other. They planted an American flag and left a plaque:

Here men from planet Earth first set foot upon the Moon. July 1969 A.D. We came in peace for all mankind.

After 21.6 hours total time on the moon, Armstrong and Aldrin safely left the surface in the lunar module and docked with Columbia for their return to earth. The backup commander for Apollo 11, Jim Lovell, was not needed for America's first moon landing. Nine months later, he would make his own trip. He thought he would land on the moon. Instead, Lovell needed all his skills to avoid a space disaster.