Beijing Ancient Observatory

The Beijing Ancient Observatory (traditional Chinese: 北京古觀象臺; simplified Chinese: 北京古观象台; pinyin: Běijīng Gǔ Guānxiàngtái) is a pretelescopic observatory located in Beijing, China. The observatory was built in 1442 during the Ming dynasty, and expanded during the Qing. It received major reorganization and many new, more accurate instruments from Europeans (Jesuits) in 1644.

This article is about the originally pre-telescopic observatory that ceased astronomical operations before World War II. For the post-Communist revolution observatory, see Beijing Astronomical Observatory. For the planetarium, see Beijing Planetarium. For the Chinese national observatory network headquartered in Beijing, see National Astronomical Observatory of China.
Beijing Ancient Observatory
On the grounds of the Beijing Ancient Observatory with a bronze bust of the astronomer and mathematician Guo Shoujing in the foreground.
LocationJianguomen Subdistrict, Dongcheng, Beijing, PRC
Coordinates39°54′22″N 116°25′41″E
Websitewww.bjp.org.cn/misc/node_4542.htm
Location of Beijing Ancient Observatory
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As one of the oldest observatories in the world, the Beijing Ancient Observatory grounds cover an area of 10,000 square meters. The observatory itself is located on a 40 by 40 metres (130 ft × 130 ft) wide platform on the top of a 15 m (49 feet) tall brick tower, an extant portion of the old Ming dynasty era city wall that once encircled Beijing. Several of the bronze astronomical instruments are on the platform, and other armillary spheres, sundials, and other instruments are located nearby at ground level. It is operated as a museum in affiliation with the Beijing Planetarium.

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