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Mission Elapsed Time : ウィキペディア英語版 | Mission Elapsed Time Mission Elapsed Time (MET) is used by NASA during their space missions, most notably during their Space Shuttle missions. Because so much of the mission depends on the time of launch, all events after launch are scheduled on the Mission Elapsed Time. This avoids constant rescheduling of events in case the launchtime slips. The MET-clock is set to zero at the moment of liftoff and counts forward in normal days, hours, minutes, and seconds. For example, 2/03:45:18 MET means it has been 2 days, 3 hours, 45 minutes, and 18 seconds since liftoff.〔(【引用サイトリンク】title=Ask the STS-113 crew: Question 14 )〕 The International Space Station (ISS) does not use an MET clock since it is a "permanent" and international mission. The ISS observes Coordinated Universal Time (UTC/GMT). When the shuttle visits ISS the ISS-crew usually adjusts their workday to the MET clock to make work together easier. The shuttles also have UTC clocks so that the astronauts can easily figure out what the "official" time aboard ISS is.〔(Eds Musings from Space ) Expedition 7 astronaut Ed Lu, Updated: 09/08/2003 Accessed August 2007〕 ==References==
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