Ondřejov | |
|---|---|
Church of Saints Simon and Jude | |
| Coordinates:49°54′17″N14°47′3″E / 49.90472°N 14.78417°E /49.90472; 14.78417 | |
| Country | |
| Region | Central Bohemian |
| District | Prague-East |
| First mentioned | 1352 |
| Area | |
• Total | 18.15 km2 (7.01 sq mi) |
| Elevation | 467 m (1,532 ft) |
| Population (2025-01-01)[1] | |
• Total | 1,883 |
| • Density | 103.7/km2 (268.7/sq mi) |
| Time zone | UTC+1 (CET) |
| • Summer (DST) | UTC+2 (CEST) |
| Postal codes | 251 65, 251 66 |
| Website | www |
Ondřejov (Czech pronunciation:[ˈondr̝ɛjof]) is a municipality and village inPrague-East District in theCentral Bohemian Region of theCzech Republic. It has about 1,900 inhabitants. It is known for theOndřejov Observatory. The historic centre is well preserved and is protected as anurban monument zone.
Ondřejov consists of three municipal parts (in brackets population according to the 2021 census):[2]
Ondřejov (meaning "Ondřej's") was probably named after its founded Ondřej of Dubá.Saint Andrew (Czech:svatý Ondřej) is in the municipal coat of arms.[3]
Ondřejov is located about 25 kilometres (16 mi) southeast ofPrague. It lies in theBenešov Uplands. The highest point is the Pecný hill at 545 m (1,788 ft) above sea level.
The first written mention of Ondřejov is from 1352.[3] Among the owners of the village were the noble families of Dubá, Kostka of Postupice, Šelenberk andWaldstein. The development of Ondřejov was greatly hampered by theHussite Wars in the 15th century and theThirty Years' War in the 17th century. In 1745, Ondřejov was promoted to amarket town, but it lost the title after World War II.[4]
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| Source: Censuses[5][6] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
TheD1 motorway from Prague toBrno passes through the western part of the municipal territory.

In 1898–1906, the industrialist Josef Jan Frič built an astronomical observatory in the village, which he gave to theCharles University in 1928. Today theOndřejov Observatory is operated by theAstronomical Institute of the Czech Academy of Sciences. Its part is also theVojtěch Šafařík Astronomical Museum.[7]
The Church of Saints Simon and Jude was originally a Romanesque building, modified in the Baroque style in 1668. The adjacent Baroque building of the rectory was built in 1778–1780.[8]