Universal prime meridian definition of Universal prime meridian in the Free Online Encyclopedia.

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.

prime meridian

the 0° meridian from which the other meridians or lines of longitude are calculated, usually taken to pass through Greenwich

prime meridian [′prīm mə‚rid·ē·ən]

(geodesy)

The meridian of longitude 0°, used as the origin for measurement of longitude; the meridian of Greenwich, England, is almost universally used for this purpose.

prime meridian (redirected from Universal prime meridian)

prime meridian
(redirected from Universal prime meridian)