Template:Selected anniversaries/April 17
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1627: Mathematician Pierre de Fermat uses scrying engine techniques to attend lecture by Jan Kochanowski.
1957: Jan Kochanowski adapts Nebra sky disk for use with Project SCORE satellite.
1958: Project SCORE satellite incorporates virtual Nebra sky disk as backup navigation system.
1974: Vandal Savage uses solar eclipse to manufacture large quantity of military-grade Thefixisin.