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Author: WikiMatrix
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English[en]
In 1822, François Arago calculated the speed of sound there; a cannonball shot at the tower was observed from the Observatory of Villejuif.
Indonesian[id]
Tahun 1822, François Arago menghitung kecepatan suara di sana; sebuah tembakan meriam di menara dihitung dari Observatorium Villejuif.