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Degrees may also be expressed as a decimal fraction: 23.45833° E.For calculations, the angular measure may be converted to radians, so longitude may also be expressed in this manner as a signed fraction of .
John Harrison, a self-educated English clockmaker, invented the marine chronometer, the key piece in solving the problem of accurately establishing longitude at sea, thus revolutionising and extending the possibility of safe long distance sea travel.
Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to 180° eastward and −180° westward.
The Greek letter λ (lambda), is used to denote the location of a place on Earth east or west of the Prime Meridian.
The measurement of longitude is important both to cartography and for ocean navigation.
Mariners and explorers for most of history struggled to determine longitude.
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For higher precision, the seconds are specified with a decimal fraction.