The Catalan mathematician Ramon Lull, in an encyclopaedic work written in about 1286, asks how sailors measure their mileage at sea.
UMcatalan oyinzulu lwazi yezibalo uRamon Lull, umsebenzi wentsilalwazi wabhalwa ngaphakathi malunga newaka linye linmakhulu mabini anamashumi asibhozo anesithandathu, wabuza ukuba abahambi ngenqanawa bawumenta kanjani ugama wabo ohanjiweyo ngemayile elwandle.