The first voyage of James Cook was a combined Royal Navy and Royal Society expedition to the south Pacific Ocean aboard HMS Endeavour, from 1768 to 1771. The aims were to observe the 1769 transit of Venus from Tahiti and to seek evidence of the postulated Terra Australis Incognita or "undiscovered southern land". It was the first of three voyages of which James Cook was the commander.
The voyage was commissioned by King George III and commanded by Lieutenant Cook, a junior naval officer with good skills in cartography and mathematics. Departing from Plymouth Dockyard in August 1768, the expedition crossed the Atlantic, rounded Cape Horn and reached Tahiti in April 1769, before the expected transit on 3 June. After the observation, Cook stopped at the nearby islands of Huahine, Borabora and Raiatea to claim them for Great Britain before sailing into the largely uncharted ocean to the south and west. In October, the expedition reached New Zealand; Cook was only the second European to visit there, following the first voyage of Abel Tasman 127 years earlier. Cook and his crew spent the following six months charting the New Zealand coast, before resuming their voyage westward across open sea. In April 1770 they became the first known Europeans to reach the east coast of Australia, making landfall near present-day Point Hicks, and then proceeding north to Botany Bay.
The expedition continued northward along the Australian coastline, narrowly avoiding shipwreck on the Great Barrier Reef. In October 1770 the badly damaged Endeavour came into the port of Batavia in the Dutch East Indies, her crew sworn to secrecy about the lands they had discovered. They resumed their journey on 26 December, rounded the Cape of Good Hope on 13 March 1771, and reached the English port of Deal on 12 July. The voyage lasted almost three years.
The year following his return, Cook left on a second circumnavigation (1772 to 1775), again in search of Terra Australis.
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