Ancient Greeks and medieval astronomers were already familiar with the fact that longitude differences could be determined by noting the local time of occurrence of some clear celestial event.
AmaGrike amandulo nabafundi zinkwenkwezi bamaxesha emedi, babesele beqhelene nenyaniso yokuba umahluko ngokweside unokuthekelelwa ngokuqaphela ixesha lokubonakala okucacileyo kwesiganeko sasenyangeni.