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High Quality Content by WIKIPEDIA articles! The Ond ejov Observatory ( Czech: Observato Ond ejov) is the principal observatory of the Astronomical Institute (Astronomický ústav) of the Academy of Sciences of the Czech Republic. It is located near the village of Ond ejov, 35 km southeast of Prague. The facility was constructed in 1898 by Czech amateur astronomer Josef Jan Fri as a private observatory. Fri donated the facility to the Czechoslovak state on October 28, 1928 to celebrate the tenth anniversary of its independence. The observatory, located at an altitude of 500 m, away from the air and light pollution of urban Prague, was administered by Charles University until the founding of the Czechoslovak Academy of Sciences in 1953, which from then on operated it as part of its Astronomical Institute in conjunction with other Czechoslovak observatories.