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Chronometer measures longitude East or West of the prime meridian, 0 degrees, located on the longitudinal meridian running through Greenwich, England. A chronometer is simply a precise clock or watch capable of denoting time in the 24 hour basis. The time at Greenwich and all along the 0 prime meridian is known as GMT, Greenwich Mean Time or sometimes as "Zulo" time. The line at 180 degrees East or West is known as the International Date Line.

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13y ago
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13y ago

The spring-powered clock.

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Q: What instrument made accurate measurements of longitude possible?
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