prime meridian

n.1. A meridian used as a reference line from which longitude east and west is measured.2. Prime Meridian The meridian passing through Greenwich, England, designated as the zero meridian (0°) by an international conference in 1884.

prime meridian

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

prime′ merid′ian

n. the meridian running through Greenwich, England, from which longitude east and west is reckoned. [1860–65]

prime meridian

(prīm) The meridian with a longitude of 0°, used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.

prime meridian

An imaginary north-south line of longitude that passes through Greenwich, England, and is used as the basis for longitudinal measurements on the globe.

Thesaurus

Noun

prime meridian - meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)line of longitude, meridian - an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude"

prime meridian

prime meridian,

meridian that is designated zero degree (0°) longitude, from which all other longitudes are measured. By international convention, it passes through the site of the Royal Observatory in Greenwich, England; for this reason, it is sometimes called the Greenwich meridian. Universal timeuniversal 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 timecivil 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 arbitrary circle of zero longitude on the Earth or some other planet or mapped celestial body. The Earth's prime meridian is the Greenwich meridian.

Prime Meridian

(or zero meridian), the terrestrial meridian that passes through Greenwich, the site of the old Royal Observatory. The prime meridian is the starting point for the calculation of geographic longitude and is the central meridian of the zero time zone. Local mean solar time at the prime meridian is widely used in astronomy (so-called universal time).

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

The meridian passing through Greenwich (UK). It is longitude 0°. See longitude.

prime meridian

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

prime meridian

prime meridian

prime meridian

prime′ merid′ian

prime meridian

prime meridian

prime meridian

prime meridian,

prime meridian

Prime Meridian

prime meridian

prime meridian

prime meridian

prime meridian

Words related to prime meridian

noun meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich longitude in England)

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