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==Astronomy== * [[John Bevis]] observes the [[Crab Nebula]] for the first time in the modern era. * The [[octant (instrument)|octant]] is developed by [[John Hadley]] (it will eventually be replaced as an essential tool of navigation by the [[sextant]]). * The [[orrery]] (or [[planetarium]] model) is developed as an apparatus showing the relative positions of heavenly bodies in the [[Solar System]] by using balls moved by wheelwork.
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