Greenwich Mean Time (GMT)
Original archive entry. The text, images and links below are kept as they were written.
The local mean time at the Greenwich, England meridian. Some of the Lunar Orbiter post-launch operations reports used the local time at the Kennedy Space Center, expressed either in Eastern Standard Time (EST, 5 hours behind GMT) or Eastern Daylight Time (EDT, 4 hours behind GMT), depending on the time of year when a launch took place.