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The International Latitude Service was created by the International Geodetic Association in 1899 to study variations in latitude caused by polar motion, precession, or "wobble" of the Earth's axis. The original International Latitude Observatories were a system of six observatories located near the parallel of 39° 08' north latitude. The alignment of all six stations along the parallel helped the observatories to perform uniform data analysis. The original six observatories were located in: The final six observatories were located, in order of Longitude (E to W), in:

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  • Servicio internacional de latitud (es)
  • International Latitude Service (en)
  • Servizio internazionale delle latitudini (it)
  • 国際緯度観測所 (ja)
  • Observatório Internacional de Latitude (pt)
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  • 国際緯度観測所 (こくさいいどかんそくじょ、英語: International Latitude Observatory、国際共同緯度観測所とも呼ばれる) は北緯39° 08'の同一緯線上に並ぶ形で建設された6つの天文台である。国際緯度観測所は地軸の微小な振動運動の結果生じる誤差を測定するために建設された。 (ja)
  • Il servizio internazionale delle latitudini o ILS era una rete di osservatori astronomici, composta in origine di sei osservatori posizionati tutti approssimativamente sulla latitudine Nord di 39° 08', usata per misurare la variazione di latitudine risultante dall'oscillazione dell'asse di rotazione della Terra.I sei osservatori originali erano situati in: Carloforte (Sardegna), Charjui (Turkestan), Cincinnati (Ohio, Usa), Gaithersburg (Maryland, Usa), e Ukiah (California, Usa). (it)
  • El Servicio Internacional de Latitud fue una red de observatorios situados sobre la misma latitud cuya función era registrar mediante observaciones astronómicas la oscilación periódica del eje terrestre causante del movimiento de los polos.​ El Servicio Internacional de Latitud comenzó a funcionar en 1899 y constó inicialmente con seis observatorios situados todos aproximadamente en la latitud 39°08' N. Las ubicaciones de estos observatorios fueron: * Gaithersburg, Maryland, EE. UU. * Cincinnati, Ohio, EE. UU. * Ukiah, California, EE. UU. * * Charjui, Turkmenistán * Carloforte, Italy (es)
  • The International Latitude Service was created by the International Geodetic Association in 1899 to study variations in latitude caused by polar motion, precession, or "wobble" of the Earth's axis. The original International Latitude Observatories were a system of six observatories located near the parallel of 39° 08' north latitude. The alignment of all six stations along the parallel helped the observatories to perform uniform data analysis. The original six observatories were located in: The final six observatories were located, in order of Longitude (E to W), in: (en)
  • O Observatório Internacional de Latitude foi um conjunto de seis observatórios localizados no paralelo 39º 08' da latitude norte. Esses observatórios foram usados para medir a variação da latitude que ocorre como resultado da Wobble do planeta Terra sobre o seu . Esses seis observatórios localizavam-se nestas regiões mostradas abaixo com as suas respectivas coordenadas. (pt)
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  • location (en)
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  • International latitude observatory of Ukiah, California, 1909 (en)
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  • 39.136808333333335 -77.19884722222223
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  • El Servicio Internacional de Latitud fue una red de observatorios situados sobre la misma latitud cuya función era registrar mediante observaciones astronómicas la oscilación periódica del eje terrestre causante del movimiento de los polos.​ El Servicio Internacional de Latitud comenzó a funcionar en 1899 y constó inicialmente con seis observatorios situados todos aproximadamente en la latitud 39°08' N. Las ubicaciones de estos observatorios fueron: * Gaithersburg, Maryland, EE. UU. * Cincinnati, Ohio, EE. UU. * Ukiah, California, EE. UU. * * Charjui, Turkmenistán * Carloforte, Italy Con los años los observatorios fueron variando. El observatorio de Charjui dejó de tomar datos en 1919 y trasladado a en 1927 donde comenzaron nuevamente las observaciones.. El observatorio de Cincinnati se cerró en 1916 por razones económicas. El de Gaithersburg se cerró en 1915 pero luego fue reabierto. Todo esto llevó a la necesidad de expandir la red de observatorios y se añadieron observatorios en el hemisferio sur situados en y Oncativo, Argentina. Este último luego fue trasladado al Observatorio Astronómico de La Plata.​​ En el año 1988 el sistema de observatorios fue desarmado debido a que resultaba obsoleto. A partir de esa fecha el estudio de las oscilaciones del eje terrestre se realiza mediante técnicas geodésicas espaciales, como o GPS.​ (es)
  • The International Latitude Service was created by the International Geodetic Association in 1899 to study variations in latitude caused by polar motion, precession, or "wobble" of the Earth's axis. The original International Latitude Observatories were a system of six observatories located near the parallel of 39° 08' north latitude. The alignment of all six stations along the parallel helped the observatories to perform uniform data analysis. The original six observatories were located in: * Gaithersburg, Maryland, United States * Cincinnati, Ohio, United States * Ukiah, California, United States * Mizusawa, Iwate, Japan * Charjui, Turkmenistan * Carloforte, Italy Twelve groups of stars were studied in the program, each group containing six pairs of stars. Each night, each station observed two of the star groups along a preset schedule and later compared the data against the measurements taken by the sister stations.Economic difficulties and war caused the closings of some of the original stations, though a newer station was created in Uzbekistan after World War I. The data collected by the observatories over the years still has use to scientists, and has been applied to studies of polar motion, the physical properties of the Earth, climatology and satellite tracking and navigation. The final six observatories were located, in order of Longitude (E to W), in: * Gaithersburg, Maryland, USA, Gaithersburg Latitude Observatory: 39°08′12.51″N 77°11′55.85″W / 39.1368083°N 77.1988472°W * Cincinnati, Ohio, USA: 39°08′20.45″N 84°25′24″W / 39.1390139°N 84.42333°W * Ukiah, California, USA: 39°08′14.26″N 123°12′42.54″W / 39.1372944°N 123.2118167°W * Mizusawa, Japan, National Institutes of Natural Sciences National Astronomical Observatory of Japan, Mizusawa VERA Observatory: 39°08′6″N 141°07′54″E / 39.13500°N 141.13167°E * Kitab, in Uzbekistan: 39°08′0″N 66°52′54″E / 39.13333°N 66.88167°E * Carloforte, Italy: 39°08′13.76″N 8°18′41.90″E / 39.1371556°N 8.3116389°E 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. (en)
  • 国際緯度観測所 (こくさいいどかんそくじょ、英語: International Latitude Observatory、国際共同緯度観測所とも呼ばれる) は北緯39° 08'の同一緯線上に並ぶ形で建設された6つの天文台である。国際緯度観測所は地軸の微小な振動運動の結果生じる誤差を測定するために建設された。 (ja)
  • Il servizio internazionale delle latitudini o ILS era una rete di osservatori astronomici, composta in origine di sei osservatori posizionati tutti approssimativamente sulla latitudine Nord di 39° 08', usata per misurare la variazione di latitudine risultante dall'oscillazione dell'asse di rotazione della Terra.I sei osservatori originali erano situati in: Carloforte (Sardegna), Charjui (Turkestan), Cincinnati (Ohio, Usa), Gaithersburg (Maryland, Usa), e Ukiah (California, Usa). (it)
  • O Observatório Internacional de Latitude foi um conjunto de seis observatórios localizados no paralelo 39º 08' da latitude norte. Esses observatórios foram usados para medir a variação da latitude que ocorre como resultado da Wobble do planeta Terra sobre o seu . Esses seis observatórios localizavam-se nestas regiões mostradas abaixo com as suas respectivas coordenadas. * Cincinnati, Ohio, EUA N 39:08.3 84:25.4 W * Gaithersburg, Maryland, EUA N 39:08:12.51 77:11:55.85 W * Ukiah, Califórnia, EUA N 39:08:14.26 W 123:12:42.54 * Carloforte, Itália N 39:08:13.76 E 8:18:41.90 * Mizusawa, Iwate, Japão N 39:08.1 E 141:07.9 * Charjui, Turcomenistão N 39:08.0 66:52.9 E (pt)
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