prime meridian


Also found in: Dictionary, Thesaurus, Acronyms, Wikipedia.

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 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
References in periodicals archive ?
Professor Charles Withers, who is Ogilvie Chair of Geography at the University of Edinburgh, discusses the challenges and dangers of attempting to navigate a world with multiple prime meridians as increased globalization and advances in transportation made the seas busier and brought nations closer together.
Blaeu published three small terrestrial globes using the Corvo and Flores prime meridian before 1620.
Barrows's uncovering of an incipient anti-globalization in the Prime Meridian Conference lays the foundation for his entry into the long debate on modernism and temporality.
8 Through which London borough does the Prime Meridian run?
The Canary Islands indeed were used as a longitude reference by the Greeks and in particular by Ptolemy, who located his prime meridian through Hierro, the westernmost island.
Five continents, five oceans, the Prime Meridian crossing the
He describes the history of the international technical accords on the International Date Line, the system of standard time zones around the globe, and Daylight Saving Time, all of which are linked to international acceptance of Greenwich as the prime meridian.
Walking zero; discovering cosmic space and time along the prime meridian.
Author Chet Raymo is a physicist and astronomer, and his WALKING ZERO: DISCOVERING COSMIC SPACE AND TIME ALONG THE PRIME MERIDIAN focuses on the history of the prime meridian and its impact on scientific luminaries throughout the ages.
Pilots are most familiar with this because the prime meridian hosts Greenwich Mean Time (GMT), also known as Universal Time Coordinated (UTC) or, most simply, "Z.
Longitude lines run north/south from the North Pole to the South Pole and are used to measure how far east or west an object is from the prime meridian (our starting point).

Full browser ?