Greenwich Mean Midnight

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Greenwich Mean Midnight

 

the instant of lower transit across the prime, or Greenwich, meridian by the fictitious point on the celestial sphere known as the mean sun. Universal, or Greenwich mean, time is reckoned from Greenwich mean mid-night through 24 hours to the following midnight. Universal time is the mean solar time at the meridian that passed through the meridian circle of the Royal Greenwich Observatory until the observatory was moved from London to Herstmonceux, 70 km southeast of London.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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