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The IERS was established in its present form in 1987 by the International Astronomical Union and the International Union of Geodesy and Geophysics, replacing the earlier International Polar Motion Service (IPMS) and the Earth rotation section of the Bureau International de l'Heure (BIH). The service began operation on January 1, 1988.
The International Plastic Modellers' Society (often shortened to IPMS) is an international organisation of hobbyists interested in building plastic model kits. The Society is made up of national branches, and within these, local clubs who usually represent a town, city or locality.
The ILS was renamed International Polar Motion Service (IPMS) in 1962. It was replaced when the International Earth Rotation Service (IERS) was established in 1987. See also
National systems: United States: WGS 84 (see above); domestic use is mainly based on NAD 83 instead. China: CTRF 2000 per above. The GPS reference epoch was moved from 2000.0 to 2001.0 in G1150 due to an Alaskan earthquake in November 2002.
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The most important reason for the 5.3 seconds of longitude offset between the IERS Reference Meridian and the Airy transit circle is that the observations with the transit circle were based on the local vertical, while the IERS Reference is a geodetic longitude, that is, the plane of the meridian contains the center of mass of the Earth.