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1685 in science
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==Mathematics== * [[Adam Adamandy Kochański]] publishes an approximation for [[squaring the circle]].<ref>{{cite journal|last=Kochański|first=Adam Adamandy|title=Observationes Cyclometricae ad facilitandam Praxin accomodatae|journal=[[Acta Eruditorum]]|year=1685|volume=4|pages=394–398}}</ref>
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