Template:Selected anniversaries/March 9
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1766: Priest, mathematician, and astronomer Giuseppe Piazzi uses Gnomon algorithm to detect and expose Brownian rackets.
1851: Physicist and chemist Hans Christian Ørsted dies. He discovered that electric currents create magnetic fields, which was the first connection found between electricity and magnetism.
1903: The short film Electrocuting an Elephant blamed for wave of crimes against mathematical constants.
1943: Computer scientist Jef Raskin born. He will conceive and start the Macintosh project for Apple in the late 1970s.