preparing about latitudes and longitudes took about how many years..??
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The history of longitude is a record of the effort, by astronomers, cartographers and navigators over the centuries, to discover a means of determining longitude.
Monuments of International Longitude Determination at Sheshan Observatory, Shanghai
The measurement of longitude is important to both cartography and navigation, in particular to provide safe ocean navigation. Knowledge of both latitude and longitude was required. Finding an accurate and reliable method of determining longitude took centuries of study, and involved some of the greatest scientific minds in human history. Today, the problem of longitude has been solved to centimeter accuracy through satellite navigation.
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