These are not necessarily major milestones of the mission but are some of the more interesting and clearly recorded conversations the crew members had among themselves as the mission progressed.
It is best to listen to the tapes while simultaneously viewing the same mission elapsed time on the transcript, since often the recordings are faint.
NASA will provide a unique audio "time capsule" in observance of the 40th anniversary of the first human landing on the moon. Audio from the entire Apollo 11 mission will be replayed and streamed on the Internet at exactly the same time and date it was broadcast in 1969. The audio retrospective will begin at launch minus two hours, 7:32 a.m. EDT July 16, and continue through splashdown of the mission at 12:51 p.m. July 24 and the recovery of the crew shortly afterward.
The Apollo 11 Onboard Audio Tape Database cross references the tape numbers to the Mission Elapsed Time (MET) that was on each tape.
A complete description of the history of onboard audio recordings from Apollo and other historic NASA missions, including a more detailed explanation of how recordings were made during Apollo 11, including imagery and graphics of the technical systems, is available.
All mission transcripts, onboard audio as well as other mission audio, from NASA's historic early missions, including all Apollo flights, are available.