It takes approximately 48 to 72 hours for your level of hCG to double its levels. What this means for you depends on your body. If your level of hCG prior to pregnancy is 2 miU, it might take two to three days for it to double to 4 mIU and another two to three days for that to double to 8 mIU. This means it could take a week for the most sensitive pregnancy test to determine whether or not you a pregnant.
Navigation at Sea, History of. The first Western civilization known to have developed the art of navigation at sea were the Phoenicians, about 4,000 years ago (c. 2000 B.C.E. ). Phoenician sailors accomplished navigation by using primitive charts and observations of the Sun and stars to determine directions.
The best seafarers and ship builders of the ancient world were the Phoenicians. The famous Lebanese cedar tress covering the slopes of mountains of their native land was a perfect material for construction of strong seaworthy ships.erodotus tells us that 'The Phoenician ships were the best sailers in the fleet, and the Sidonian the best among the Phoenicians. The contingent of each nation, whether to the fleet or to the land army, had at its head a native leader'.