Timer, GMT Display, Shuttle

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    IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu

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    Timer, GMT Display, Shuttle

    Digital timer marked to read out in Days, Hours, Minutes, Seconds; black metal case with red LED numerals and white labels; GMT=Greenwich Mean Time

    1 of 2

    Usage Conditions Apply

    There are restrictions for re-using this media. For more information, visit the Smithsonian's Terms of Use page.

    IIIF provides researchers rich metadata and image viewing options for comparison of works across cultural heritage collections. More - https://iiif.si.edu

    View Manifest

    View in Mirador Viewer

    Timer, GMT Display, Shuttle

    Digital timer marked to read out in Days, Hours, Minutes, Seconds; black metal case with red LED numerals and white labels; GMT=Greenwich Mean Time

    2 of 2

Display Status:

This object is on display in the Moving Beyond Earth exhibition at the National Air and Space Museum in Washington, DC.

At orbital speed, spacecraft circle the Earth every 90 minutes, with a sunrise or sunset every 45 minutes, making it difficult to keep track of time as usual. Time in space is tracked more than one way, by reference to more than one location or standard, such as Houston time or mission elapsed time (MET). Another way is Greenwich Mean Time or Universal Time (GMT or UT), the time at the Greenwich Observatory near London, where by international agreement, each 24-hour day starts and ends. This is a GMT digital clock; it would be set to display Greenwich time in the Mission Control Center or on a spacecraft for comparison to “local” and mission elapsed time. From GMT, one can add or subtract hours to know the time elsewhere in the world. NASA sent this timer to the Museum when it was no longer needed in the Space Shuttle program.