Photos: The computer programmers behind NASA's Apollo missions

Discussing the mission

Mission Control in Houston served as the brain trust for the Apollo missions.

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Image: NASA

The Apollo 11 engineering team

Engineers gathered in the Mission Evaluation Room during Apollo 11.

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Image: NASA

Man on the Moon

Buzz Aldrin's famous moonwalk was made possible by some amazing computer programmers.

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Image: NASA

The most famous footprint in history?

Buzz Aldrin's footprint left quite a mark.

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Image: NASA

A successful rescue

Three of NASA's four Apollo 13 flight directors applaud the successful splashdown of the command module Odyssey, while Manned Spacecraft Center deputy director Dr. Christopher C. Kraft Jr. lights up cigars in the upper left.

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Image: NASA

Apollo programmer Homer Ahr

Modern day photo of Homer Ahr.

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Image: Homer Ahr

The brain of mission control

The Real-Time Computer Complex (RTCC) for the Apollo Program's Mission Control Center at Johnson Space Center. The RTCC was situated on the first floor in Building 30, below the Mission Operation Control Rooms. There were no windows to the outside world in any of these rooms.

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Image: Homer Ahr / NASA

Homer Ahr, associate programmer, maneuver control

Homer Ahr's promotion ahead of the Apollo 11 mission in July 1969 is publicized in an IBM magazine from the time.

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Image: IBM

Recent college graduate Homer Ahr

Homer Ahr pictured a couple of months before the launch of the Apollo 11 mission in July 1969.

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Image: IBM

Apollo 11 planned timeline

A timeline of key events in the forthcoming Apollo 11 mission, released a day before launch.

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Image: Homer Ahr / NASA

Manning the console

This is the RTCC console area where Ahr worked on the Dynamics Computer Console during Apollo 11.

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Image: Homer Ahr / NASA

Homer Ahr, Presidential Medal of Freedom recipient

The Presidential Medal of Freedom Award presented to Ahr for his work as part of the Apollo 13 Mission Operations Team.

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Image: Homer Ahr

How to get in the door at NASA

Ahr's Apollo 11 mission badge that allowed him entrance to the Mission Control Center during the mission.

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Image: Homer Ahr

Another angle of the RTCC

The Real-Time Computer Complex, taken from the Familiarization Manual for Mission Control Center Houston.

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Image: NASA

Live from Apollo 13

The Mission Operations Control Room in NASA's Mission Control Center at the Manned Spacecraft Center (now Johnson Space Center) in Houston. The image was taken on April 13, 1970, during the fourth television transmission from the Apollo 13 mission.

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Image: NASA

Where the Apollo astronauts trained

The Apollo command module mission simulator.

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Image: NASA

Apollo command module mission simulator

The Apollo command module mission simulator at Manned Spacecraft Center, where Apollo astronauts practiced for their missions.

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Image: NASA

Celebrating the Apollo 11 landing

Flight controllers celebrate the successful conclusion of the Apollo 11 lunar landing mission in the Mission Operations Control Room in the Mission Control Center.

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Image: NASA

Walking on the Moon

Astronaut and lunar module pilot Edwin E. Aldrin Jr. beside the US flag on the lunar surface during Apollo 11. The lunar module is on the left, and the footprints of the astronauts are clearly visible in the soil of the moon.

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Image: NASA

The brains of the Saturn V rocket

The Saturn V Instrument Unit (IU), the "brains" of the Saturn V rocket, was manufactured at International Business Machines (IBM) in Huntsville, Alabama. The IU was three-feet tall, twenty-one feet in diameter, and weighed about 4,000 pounds, and contained the navigation, guidance, control, and sequencing equipment.

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Image: NASA

Apollo 13's main computer

The Apollo Display & Keyboard (DSKY) was the main interface with the Apollo Guidance Computer used onboard the spacecraft. This unit is from the main display console of the command module Odyssey used during Apollo 13.

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Image: NASA

Homer Ahr today

A modern day image of Homer Ahr.

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Image: IBM

Liftoff

The launch of Apollo 4 was the first from NASA's Kennedy Space Center in Florida.

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Image: NASA

Ahr's guest pass from Apollo 17's launch

The VIP parking pass and badge used by Homer Ahr and his wife Carol when they were IBM honored guests of the astronauts and the NASA Manned Flight Awareness Program for Apollo 17, the last mission to the moon and back.

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Image: Homer Ahr