In navigation also and colonisation Sidon took the lead. According to some, she was the actual founder of Aradus, which was said to have owed its origin to a body of Sidonian exiles, who there settled themselves.[1423] Not much reliance, however, can be placed on this tradition, which first appears in a writer of the Augustan age. With more confidence we may ascribe to Sidon the foundation of Citium in Cyprus, the colonisation of the islands in the Ægean, and of those Phoenician settlements in North Africa which were anterior to the founding of Carthage. It has even been supposed that the Sidonians were the first to make a settlement at Carthage itself,[1424] and that the Tyrian occupation under Dido was a recolonisation of an already occupied site. Anyhow, Sidon was the first to explore the central Mediterranean, and establish commercial relations with the barbarous tribes of the mid-African coast, Cabyles, Berbers, Shuloukhs, Tauriks, and others. She is thought to claim on a coin to be the mother-city of Melita, or Malta, as well as of Citium and Berytus;[1425] and, if this claim be allowed, we can scarcely doubt that she was also the first to plant colonies in Sicily. Further than this, it would seem, Sidonian enterprise did not penetrate. It was left for Tyre to discover the wealth of Southern Spain, to penetrate beyond the Straits of Gibraltar, and to affront the perils of the open ocean. But, within the sphere indicated, Sidonian rovers traversed all parts of the Great Sea, penetrated into every gulf, became familiar sights to the inhabitants of every shore. From timid sailing along the coast by day, chiefly in the summer season, when winds whispered gently, and atmospheric signs indicated that fair weather had set in, they progressed by degrees to long voyages, continued both by night and day,[1426] from promontory to promontory, or from island to island, sometimes even across a long stretch of open sea, altogether out of sight of land, and carried on at every season of the year except some few of special danger. To Sidon is especially ascribed the introduction of the practice of sailing by night,[1427] which shortened the duration of voyages by almost one-half, and doubled the number of trips that a vessel could accomplish in the course of a year. For night sailing the arts of astronomy and computation had to be studied;[1428] the aspect of the heavens at different seasons had to be known; and among the shifting constellations some fixed point had to be found by which it would be safe to steer. The last star in the tail of the Little Bear--the polar star of our own navigation books--was fixed upon by the Phoenicians, probably by the Sidonians, for this purpose,[1429] and was practically employed as the best index of the true north from a remote period. The rate of a ship’s speed was, somehow or other, estimated; and though it was long before charts were made, or the set of currents taken into