Real Reading 2 23. The Chronometer(David Wiese Pearson Longmen)

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It was the greatest scientific problem of the time. As sailors traveled the world's oceans, they did not know the exact location of their ships. Some ships entered dangerous waters. Powerful storms sent them to the bottom of the ocean. Other ships sailed into rocks. Those who survived often could not find their way home. It was a dangerous time to be a sailor.

This was the eighteenth century. To make a safe journey, a ship's captain needed to know his ship's longitude and latitude. Longitude and latitude are lines on a map of the Earth. They are used to pinpoint an exact location. Latitude lines go from left to right and tell north-south position. Latitude lines go up and down and tell east-west position. By observing the sun, moon, and stars with a sextant, eighteenth century ships sere able to find their latitude but not their longitude. As a result, maps were not accurate. Ship captains had to guess their latitude, often with disastrous results.

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Harrison이 경도 상을 받는데는 또 다른 20년간이 걸렸다. 많은 사람들은 Harrison의 시계가 정말로 1773년도에 수상한 것을 믿지 못했다, 왕이 개인적으로 이 시계를 테스트를 한 후인. 80살에, 그의 죽음의 단지 3년 전에, Harrison은 그의 자격있는 명성과 돈을 받았다.

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