1643 (MDCXLIII) ebile ngwaga wa go thoma ka Labone, ngwaga wa bone ngwagengsome wa 1640s, ngwaga wa bomasomenne tharo ngwagengkgolo wa Ngwagakgolo 17, le ngwaga wa bomakgolo tshela masomenne tharo ngwagengkete wa Ngwagakete 2. Pherekgong 4 - Sir Isaac Newton