Editing 1666 in science (section)

==Physics==
* [[Isaac Newton]] uses a prism to split sunlight into the component colours of the [[optical spectrum]], assisting understanding of the nature of [[light]].
* [[Robert Hooke]] and [[Giovanni Alfonso Borelli]] both expound [[gravitation]] as an attractive force (Hooke's lecture "On gravity" at the [[Royal Society]] of London on March 21; Borelli's ''Theoricae Mediceorum planetarum ex causis physicis deductae'', published in [[Florence]] later in the year).<ref>{{cite book|page=239|first=Curtis|last=Wilson|year=1989|chapter=The Newtonian achievement in astronomy|title=Planetary Astronomy from the Renaissance to the rise of astrophysics: 2A: Tycho Brahe to Newton|publisher=Cambridge University Press}}</ref>