Antarctica was imagined for centuries before anyone saw it
Marinus of Tyre coined Antarctic in the second century CE. Cook crossed the circle in 1773 without sighting mainland. Sealers and national voyages finally proved a continent around 1820–1840—then Amundsen beat Scott to the Pole on 14 December 1911.
Western geography long assumed a vast Terra Australis balancing northern lands. Once sailors rounded Africa's southern tip and later South America's Cape Horn in the 1400s–1500s, maps could no longer treat any polar continent as joined to those coasts. Magellan thought Tierra del Fuego might connect to it; Schouten and Le Maire's 1615 discovery of Cape Horn shrank that claim; Tasman in 1642 separated New Holland from any continuous polar continent. Anthony de la Roché found South Georgia in 1675—the first documented land south of the Antarctic Convergence.
James Cook's 1772–75 voyage, commanding Resolution and Adventure, first crossed the Antarctic Circle on 17 January 1773 and later reached 71°10′S on 30 January 1774—the farthest south of the eighteenth century—without seeing the mainland, perhaps coming within 240 kilometers. He mapped South Georgia and found the South Sandwich Islands, demolishing dreams of a habitable southern world. William Smith sighted the South Shetlands on 19 February 1819. The following season brought Edward Bransfield and the First Russian Antarctic Expedition, credited with the earliest, if unconscious, continental sighting.
Data from Charles Wilkes, Jules Dumont d'Urville, and James Clark Ross around 1840 confirmed a true continent, after which exploration paused for about twenty years. The Heroic Age climaxed when Roald Amundsen reached the South Pole on 14 December 1911 and Robert Falcon Scott's party died on the return. The Shackleton–Rowett expedition ending in 1922 closes that era. Permanent bases such as Mawson, McMurdo, Amundsen–Scott, and Mirny rose in the 1950s; the International Geophysical Year then led to the 1959 Antarctic Treaty System.
Source: History of Antarctica
