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Greenwich Time

the time as measured on the prime meridian running through Greenwich, England: used in England and as a standard of calculation elsewhere.
Also called Greenwich Mean Time, Greenwich Civil Time, universal time, Universal Time.
Origin of Greenwich Time
1840-50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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  • Just what the words "greenwich mean time" signify, will be explained in more detail later on.

    Lectures in Navigation Ernest Gallaudet Draper
British Dictionary definitions for greenwich mean time

Greenwich Mean Time

mean solar time on the 0° meridian passing through Greenwich, England, measured from midnight: formerly a standard time in Britain and a basis for calculating times throughout most of the world, it has been replaced by an atomic timescale GMT See universal time
Usage note
The name Greenwich mean time is ambiguous, having been measured from mean midday in astronomy up to 1925, and is not used for scientific purposes. It is generally and incorrectly used in the sense of universal coordinated time, an atomic timescale available since 1972 from broadcast signals, in addition to the earliest sense of universal time, adopted internationally in 1928 as the name for GMT measured from midnight
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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greenwich mean time in Science
Greenwich Mean Time
See universal time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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greenwich mean time in Technology

time, standard
(GMT) The local time on the Greenwich meridian, based on the hypothetical mean sun (which averages out the effects of the Earth's elliptical orbit and its tilted axis). GMT is the basis of the civil time for the UK.
In 1925 the reference point was changed from noon to midnight and it was recommended that the term "Universal Time" should be used for the new GMT.
Authorities disagreed on whether GMT equates with UT0 or UT1, however the differences between the two are of the order of thousandths of a second. GMT is no longer used for scientific purposes.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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