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Catalog Data

Manufacturer:
DATACHRON INC  Search this
Materials:
adhesive, aluminum, electrical wires, paper, plexiglass, stainless steel, scotch tape
Dimensions:
3-D: 42.5 × 11.8 × 9.5cm (16 3/4 × 4 5/8 × 3 3/4 in.)
Type:
EQUIPMENT-Electronics
Country of Origin:
United States of America
Summary:
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.
Credit Line:
Transferred from NASA
Inventory Number:
A20130102000
Restrictions & Rights:
Usage conditions apply
See more items in:
National Air and Space Museum Collection
Location:
National Air and Space Museum in Washington, DC
Exhibition:
Moving Beyond Earth
Data Source:
National Air and Space Museum
GUID:
http://n2t.net/ark:/65665/nv96d1f0187-5681-4196-8b6a-e4ee171aeff0
EDAN-URL:
edanmdm:nasm_A20130102000