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National Astronomical Observatory (Mexico)
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National Astronomical Observatory (Mexico) : ウィキペディア英語版
National Astronomical Observatory (Mexico)

The National Astronomical Observatory (Spanish: ''El Observatorio Astronómico Nacional''—OAN), the national observatory complex of Mexico, in Baja California state.
==History==
;Mexico City
The observatory was first established on the balcony of Chapultepec Castle in Mexico City in 1878. The observatory has been operated by the National Autonomous University of Mexico (UNAM) since 1929.〔
It was later moved to Palacio del Ex-Arzobispado in Tacubaya, then on the outskirts of the city on the west side of the Federal District. The location is remembered by the name Metro Observatorio, the terminal station of the Line 1 of the Mexico City Metro located nearby.
;Puebla
In the middle of the 20th century, OAN had to move from the increasingly crowded and polluted Valley of Mexico, to Tonantzintla in Puebla state, Central Mexico.
;Baja California
In 1967 excessive air pollution and night light pollution caused another move, from Puebla to atop the Sierra San Pedro Mártir mountain range of Baja California state in Northwestern Mexico.〔 The San Pedro Mártir OAN site has been found to have excellent astronomical seeing.〔 〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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