Into ekumila kuzii-dimensional ezimbini ijikeleza isazinge (okanye umbindi) somjikelezo. Into ekumila kuzii-dimensional ezintathu ijikeleza okwesazinge somgca obizwa ngokuba yi-axis. Ukuba i-axis yomjikelezo ikwalapha esiqwini, kuthiwa isiqu siyazijikeleza ngokwaso, okanye senza isizungelezane - nto leyo ethetha okokuba ijikeleza ngesantya esithile, ukanti mhlawumbi iyazijikelezela nje ingalawulwa nto oko ikwenza nge-angular momentum. Ukujikeleza okusuka kwindawo engaphandle (umzekelo umhlaba ojikeleze ilanga) ubizwa ngokuba yi-orbit okanye ngokuthe chatha ubizw ngokuba yi-orbital revolution.