WORLD HISTORY

Detailed explanation-1: -The magnetic compass is used by sailors to find direction. It contains a freely movable bar magnet that aligns along Earth’s north-south direction.

Detailed explanation-2: -Historians think China may have been the first civilization to develop a magnetic compass that could be used for navigation. Chinese scientists may have developed navigational compasses as early as the 11th or 12th century.

Detailed explanation-3: -The magnetic compass was first invented as a device for divination as early as the Chinese Han dynasty and Tang dynasty (since about 206 BC). The compass was used in Song dynasty China by the military for navigational orienteering by 1040–44, and was used for maritime navigation by 1111 to 1117.

Detailed explanation-4: -A man uses a sextant to navigate his brigantine, the Yankee. A sextant is a traditional navigational tool. It measures the angle between two objects, such as the horizon and a celestial object such as a star or planet. This angle can then be used to calculate the ship’s position on a nautical chart.