James Cook : biography
Navigation and science
Cook’s 12 years sailing around the Pacific Ocean contributed much to European knowledge of the area. Several islands such as Sandwich Islands (Hawaii) were encountered for the first time by Europeans, and his more accurate navigational charting of large areas of the Pacific was a major achievement.
To create accurate maps, latitude and longitude need to be known. Navigators had been able to work out latitude accurately for centuries by measuring the angle of the sun or a star above the horizon with an instrument such as a backstaff or quadrant. Longitude was more difficult to measure accurately because it requires precise knowledge of the time difference between points on the surface of the earth. The Earth turns a full 360 degrees relative to the sun each day. Thus longitude corresponds to time: 15 degrees every hour, or 1 degree every 4 minutes.
Cook gathered accurate longitude measurements during his first voyage due to his navigational skills, the help of astronomer Charles Green and by using the newly published Nautical Almanac tables, via the lunar distance method—measuring the angular distance from the moon to either the sun during daytime or one of eight bright stars during night-time to determine the time at the Royal Observatory, Greenwich, and comparing that to his local time determined via the altitude of the sun, moon, or stars. On his second voyage Cook used the K1 chronometer made by Larcum Kendall, which was the shape of a large pocket watch, in diameter. It was a copy of the H4 clock made by John Harrison, which proved to be the first to keep accurate time at sea when used on the ship Deptford’s journey to Jamaica, 1761–62.
Cook succeeded in circumnavigating the world on his first voyage without losing a single man to scurvy, an unusual accomplishment at the time. He tested several preventive measures but the most important was frequent replenishment of fresh food. It was for presenting a paper on this aspect of the voyage to the Royal Society that he was presented with the Copley Medal in 1776. Ever the observer, Cook was the first European to have extensive contact with various people of the Pacific. He correctly concluded there was a relationship among all the people in the Pacific, despite their being separated by thousands of miles of ocean (see Malayo-Polynesian languages). Cook came up with the theory that Polynesians originated from Asia, which was later proved to be correct by scientist Bryan Sykes. In New Zealand the coming of Cook is often used to signify the onset of colonisation.
Cook was accompanied on his voyages by many scientists, whose observations and discoveries added to the importance of the voyages. Joseph Banks, a botanist, went on the first voyage along with fellow botanist Daniel Solander from Sweden. Between them they collected over 3,000 plant species. Banks became one of the strongest promoters of the settlement of Australia by the British, based on his own personal observations.
There were also several artists on the first voyage. Sydney Parkinson was involved in many of the drawings, completing 264 drawings before his death near the end of the voyage. They were of immense scientific value to British botanists. Cook’s second expedition included the artist William Hodges, who produced notable landscape paintings of Tahiti, Easter Island, and other locations.
A number of the junior officers who served under Cook went on to distinctive accomplishments of their own. William Bligh, Cook’s sailing master, was given command of HMS Bounty in 1787 to sail to Tahiti and return with breadfruit. Bligh is most known for the mutiny of his crew which resulted in his being set adrift in 1789. He later became governor of New South Wales, where he was subject of another mutiny—the only successful armed takeover of an Australian colonial government. George Vancouver, one of Cook’s midshipmen, later led a voyage of exploration to the Pacific Coast of North America from 1791 to 1794. In honour of his former commander, Vancouver’s new ship was also christened Discovery. George Dixon sailed under Cook on his third expedition, and later commanded an expedition of his own. One of Cook’s lieutenants, Henry Roberts, spent many years after that voyage preparing the detailed charts that went into Cook’s posthumous Atlas, published around 1784.