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prime meridian |
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prime meridian, meridian that is designated zero degree (0°) longitude, from which all other longitudes are measured. By international convention, it passes through the original site of the Royal Observatory in Greenwich, England; for this reason, it is sometimes called the Greenwich meridian. Universal time universal time (UT), the international time standard common to every place in the world, it nominally reflects the mean solar time along the earth's prime meridian (renumbered to equate to civil time ). ..... Click the link for more information. , the standard basis for determining time throughout the world, is civil time civil time, local time based on universal time . Civil time may be formally defined as mean solar time plus 12 hr; the civil day begins at midnight, while the mean solar day begins at noon. ..... Click the link for more information. measured at the prime meridian. |
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| Countries wholly or partly within boundaries formed by 40[degrees]N to 50[degrees]N and the prime meridian to 10[degrees]E: -- * WALKING ZERO: Discovering Cosmic Space and Time along the Prime Meridian CHET RAYMO Distance east or west of the prime meridian as measured in degrees:-- |
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prime meridian
