Acts 21:3

Tyre] The greatest maritime city of the ancient world, claiming to have been founded as early as 2750 b.c. It produced glass and purple dye, but its chief wealth came from the fact that it almost monopolised the carrying-trade of the world. The Tyrian mariners were so skilled in astronomy, and constructed such accurate charts, that they sailed by night as well as by day, and made long voyages out of sight of land. They are known to have circumnavigated Africa—an extraordinary feat for the small ships of the ancients.