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Astronomical Tower Prague

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Mariánské náměstí 98/1, 110 00 Praha 1-Staré Město, Česká republika
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The history of the Clementinum in the Old Town in Prague is closely linked to astronomy and mathematics. An observatory in a 52 metre high tower was built by an unknown architect.

From 1750 various astronomical and climatic measurings have been performed here and the Clementinum can therefore boast the oldest uninterrupted meteorological records in the world.

Since 1842 midday used to be signalled from the Clementinum by the waiving of a flag. After this signal a round was fired from a cannon at Hradčany.