Pherekgong 4

4 Pherekgong ke letšatši la bone la Ngwaga wago tlwaelega.Letšatši le, le latela 3 Pherekgong, ebile le tla morago ga 5 Pherekgong.

 Matswalo 
 1643 - Sir Isaac Newton

Setensele:Pherekgong
Setensele:Tšhupamabaka