WHAT ALL HAPPENED ON 20. APRIL 1865
Look what happened on 20. April 1865
Astronomer Pietro Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion. (20. April 1865)
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WHAT ALL HAPPENED ON APRIL 20. 1865. Look what happened on April 20. 1865.
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