Prime Meridian shown in red
The Prime Meridian is the meridian (line of longitude) at which the longitude is defined to be 0°.
Prime Meridian: The initial meridian or longitude 0 degree (Greenwich Meridian), which creates the plane from which an angle is measured to establish the longitude of a point (see Longitude).
Prime Meridian
The zero meridian, used as a reference line from which longitude east and west is measured. It passes through Greenwich, England.
prime meridian
the specific meridian (for example, line of longitude) that is assigned the value of zero and to which all other meridians are referenced.
Prime Meridian: The line of longitude that runs through Greenwich, England, used as the origin (zero point) for longitudinal measurements.
Prime Meridian (includes other reference meridians)
For meridians used as references in surveying:
Public Land Survey System, United States
Dominion Land Survey, Canada ...
Prime Meridian
Greenwich, England
An Overview of Latitude and Longitude
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prime meridian
The prime meridian (0 degrees longitude) is the meridian that passes through Greenwich, England.
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Prime Meridian
The meridian (line of longitude) passing through the Royal Greenwich Observatory, Greenwich, England; it is the meridian at which longitude is 0 degrees. It is often referred to as the Greenwich Meridian.
Prime meridian - The meridian, or line of longitude adopted by international agreement in 1884 to be the 0° meridian from which all longitudes worldwide would be calculated. Also called the Greenwich or international meridian.
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The prime meridian divides the sphere into two hemispheres, the front hemisphere and the back hemisphere. What is the image of the back hemisphere under stereographic projection? The front hemisphere?
The prime meridian runs through Greenwich, England. Moving from the prime meridian, measures of longitude are negative to the west and positive to the east up to 180 degrees halfway around the globe.
Prime Meridian The location from which meridians of longitude are measured. Has the measure of 0° of longitude. The prime meridian was selected by international agreement to run through Greenwich, England.
Longitude is the east or west location of a point, measured as an angle from the earth's center east or west of a prime meridian, a given point on the earth's surface at 0 degrees longitude.
prime meridian Meridian of longitude 0 degrees, used as the origin for measurements of longitude. The meridian of Greenwich, England, is the internationally accepted prime meridian on most charts.
Longitude increases as you move away from the prime meridian, or 0°, in Greenwich, England. Because the lines of longitude converge at the poles, a degree of longitude represents a varying distance on the ground, depending on the latitude.
Longitude is the number of degrees east or west of the prime meridian. Latitude runs from 0 to 90 degrees and longitude runs from 0 to 180 degrees.
For example, a point on the globe may be referenced by its latitude and longitude with respect to the intersection of the Equator and the Prime Meridian, designated as 0 degrees latitude and 0 degrees longitude.
It is also necessary to select one particular semi-circular arc connecting the two poles to serve as the prime meridian for the system. The circle that lies halfway between the poles is called the equator.
The reference line of longitude (the prime meridian) runs from the north pole to the south pole through Greenwich, England.
[astronomy] The time at the prime meridian, which runs through the Royal Observatory in Greenwich, England. From 1884 to 1928, Greenwich mean time was the official name (and is still the popular name) for universal time.
meridian A line running vertically from the north pole to the south pole along which all locations have the same longitude. The Prime Meridian (0) runs through Greenwich, England.
Longitude (Long): The distance east or west of the prime meridian (measured in degrees). The prime meridian runs from the north to south pole through Greenwich, England.
The Prime Meridian and Equator serve as base references for establishing the angular movements expressed in degrees of Longitude (X) and Latitude (Y) of an imaginary vector from the center of the earth passing through any location.
Longitude: Angular measurement east and west from the prime meridian
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An east/west measurement of position in relation to the Prime Meridian, an imaginary circle that passes through the north and south poles.
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Mask Angle ...
The projections of aea, lcc, merc, leae, leac, and tmerc will generate a request to the user for the prime meridian and standard parallel for the output map.
SEE ALSO
g.proj, r.proj, v.proj, PROJ.4
Further reading ...
In the image below, the specific point on the surface of the earth is specified by the coordinate (60 °. E longitude, 55 den. N latitude). The longitude is measured as the number of degrees from the prime meridian, ...
Another problem relates to merging gazetteers containing spherical coordinates that may be based upon differing Prime Meridians.
The dark, vegetation-poor area in the upper right is East Anglia, whose rocky soils inhibit extensive farming. Through London itself passes the Prime Meridian (0°) for the global latitude-longitude coordinate system.
all quadrangles span 8° in the south-north direction, except those in row X, which ranges from 72°N to 84°N
all quadrangles span 6° from west to east, except a few at rows X and V immediately east of the prime meridian ...
The 'srtext' column is used to store the Well Known Text format of the spatial reference system, identifying datums, projections, prime meridians, units and other spatial references.
parallels of latitude to the north and south (90 degrees N is the North Pole, 90 degrees S is the South Pole), and meridians of longitude east and west (which meet at 180 degrees, commonly called the International Date Line) of the "Prime Meridian" ...
 See also: Meridian, Latitude, Location, Longitude, Coordinate
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