Captain James Cook measured longitude. He used the lunar distance method. Captain James Cook charted the Pacific Ocean.
Captain James Cook charted the Pacific Ocean and its islands three times, using John Harrison's chronometer to produce accurate charts. He used the lunar distance method. In one of the greatest coincidences in scientific history, two techniques for determining longitude at sea, lunar distances and chronometers, were developed at the same time.
Cook's maps included exact locations of the places he explored because he could calculate longitude. Recording latitude (which was easier to figure out) and longitude points for Pacific islands and points of interest meant that others could find the places Cook was exploring.
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