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date: 18 May 2021

mission elapsed time (MET) 

A Dictionary of Space Exploration
Stephen O'MearaStephen O'Meara, E. Julius DaschE. Julius Dasch

The amount of time recorded from the instant a spacecraft is launched. The MET at launch is zero, and the elapsed time of a flight is then measured in normal units. If the time of a mission is recorded as 3/06:20:51, this means 3 days, 6 hours, 20 minutes, and 51 seconds. MET is recorded by clocks on board a spacecraft (which also carries ... ...

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