Template:Selected anniversaries/June 30
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<gallery"> File:Tycho Brahe.jpg|link=Tycho Brahe (nonfiction)|1569: Astronomer Tycho Brahe uses scrying engine to forecast the Tunguska event with remarkable accuracy. File:William Oughtred.jpg|link=William Oughtred (nonfiction)|1660: Mathematician William Oughtred dies. He invented the slide rule in 1622. File:Tunguska.png|link=Tunguska event (nonfiction)|1908: The Tunguska event occurs in remote Siberia. File:Exponential-growth-diagram.svg|link=Crimes against mathematical constants|1908: Spike in crimes against mathematical constants blamed on Tunguska event. </gallery>