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IERS Reference Meridian
The
IERS Reference Meridian (IRM)
, also called the
International Reference Meridian
, is the
prime meridian
(0° longitude) maintained by the
International Earth Rotation and Reference Systems Service
(IERS). It passes about 5.3
arcseconds
east of
George Biddell Airy
's 1851
transit circle
or about at the
latitude
of the
Royal Observatory, Greenwich
. It is also the reference meridian of the
Global Positioning System
(GPS) operated by the
United States Department of Defense
, and of
WGS84
and its two formal versions, the ideal
International Terrestrial Reference System
(ITRS) and its realization, the
International Terrestrial Reference Frame
(ITRF).
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