The Astronomical tower was built thanks to the university rector Frantisek Retz in 1722.
Since the mid-1700's, Jesuits scholars and their students used the tower for astronomical and climate observations. One of the students, Antonin Strnad, started taking various meteorological and climate measurements in 1775 and since that time the measurements have been taken regularly, which makes it the longest uninterrupted observation of the climate in the world.
From 1842 to the 1920’s Prague's people were informed about high noon by a flag waving from the tower.
The Astronomical Tower was uwed for astronomical observations until the 1930’s, when astronomers moved to the new observatory in Ondrejov, south of Prague.
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