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Greenwich Mean Time or Greenwich Meridian Time (GMT) is the prime meridian located at the former Royal Observatory in Greenwich, England. The start of a solar day originally occurred at noon. But in 1925 the numbering system for GMT was changed, and 0000 GMT now allows the day to begin at midnight.

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11y ago
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15y ago

GMT (Greenwich Meridian Time)

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12y ago

P.M. I think

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Q: What is the abbreviation prime meridian?
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