In 1522, however, a Flemish professor, Gemma Frisius, pointed out that if an accurate timepiece were carried by a traveller, and kept wound up, he had only to compare it with the local time to have the change of longitude.
Kodwa ngonyaka u1522 injingalwazi engumFlemishi uGemma Frisius wadandalazisa elubala ukuba isichazi esingachananga besiphethwe ngumhambi, emane eyijikajika rhoqo, bekumele ukuba ayithelekise nexesha lendawo leyo akuyo ukuze azi utshintsho lweside.