Huairou Solar Observing Station , Chin

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Huairou Solar Observing Station (HSOS) is located on an small island near the north bank of Huairou Reservoir, 60 kms north of the downtown of Beijing. The water surrounded the station extend about 2 kms to the east, south and west of the observing tower. The observing dome is on the top of a 31-meter-high tower. The HSOS's telescope is characterized by its movable dome, which can be shifted away from the telescope when the seeing is favorable. The surrounding water reduces the temperature fluctuation at the telescope height, which is favorable for high resolution solar observing. The annual observation days are about 300.

* Latitude: 40.4N
* Longitude: 116.6E
* Altitude: 62m
* Summer Temperature: Mean 26¡ã C , Extreme Maximum >40¡ã C
* Winter Temperature: Mean -4¡ã C, Extreme Minimum -20¡ã C
* Precipitation: 500mm
* Nearest Cities: Huairou 10kms, Beijing 60kms