International Latitude Service (ILS)
Service international des latitudes
1899-09 Potsdam Germany
Founded Sep 1899, Potsdam (Germany), following detection of latitude variation reported, Salzburg (Germany), Sep 1888, at annual conference of the then "Internationale Erdmessung", from 1932 known as B-XB1291 - International Association of Geodesy (IAG). Set up following investigation of polar motion from 1758, and projects instigated Rome (Italy), Oct 1883, at 7th conference of European Arc Measurement, a forerunner of IAG. Comprised 6 sites at similar latitudes, including U-XG9490 - International Latitude Observatory (ILO), Mizusawa (Japan), and sites at: Gaithersburg, MD (USA); Cincinnati OH (USA); Ukiah CA (USA); Charjui (Russia); Carloforte (Italy). These allowed comparison of data to indicate latitude variation. Replaced, 1962, by H-XF4065 - International Polar Motion Service (IPMS).
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