Template:Selected anniversaries/June 30
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1660: Mathematician William Oughtred dies. He invented the slide rule in 1622.
1770: Astronomer Charles Messier is elected to the French Academy of Sciences.
1905: Albert Einstein sends the article "On the Electrodynamics of Moving Bodies", in which he introduces special relativity, for publication in Annalen der Physik.
1908: The Tunguska event occurs in remote Siberia.
1956: The Tunguska Event Preservation Society launches fundraiser to simulate the 1927 Tunguska expedition.