The compass opened the world to exploration and discovery. Invented in China thousands of years ago, it was primarily used by feng-shui priests, hired to advise on how and where to build. Today the compass still is a basic tool, a magnetized needle rotating on a vertical pin, pointing at the Earth’s magnetic North. 16th century sailors accustomed to following coastlines, could suddenly cross oceans. Sailors now devised a compass course, while still using their age-old knowledge of steering by fixed stars, ocean currents and prevailing winds to establish position.
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