Task: Translation
Input (Xhosa): AmaGrike amandulo nabafundi zinkwenkwezi bamaxesha emedi, babesele beqhelene nenyaniso yokuba umahluko ngokweside unokuthekelelwa ngokuqaphela ixesha lokubonakala okucacileyo kwesiganeko sasenyangeni.
Output (English): 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.