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2013-05-23 12:21
求翻译：There was no secure method of measuring longitude until the 17th century when the British solved this theoretical problem. Nobody knew that the earth moved westwards 15 degrees every hour, but sailors did know an approximate method of calculating longitude using speed and time. An early method of measuring speed involv是什么意思？ 待解决
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There was no secure method of measuring longitude until the 17th century when the British solved this theoretical problem. Nobody knew that the earth moved westwards 15 degrees every hour, but sailors did know an approximate method of calculating longitude using speed and time. An early method of measuring speed involv
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