Captain Nathaniel Palmer sights Antarctica

Background. Nathaniel Palmer was an American seal hunter who sailed southward in the sloop Hero during the Antarctic summer of 1820–1821. Aggressively searching for new seal rookeries south of Cape Horn, he discovered the Antarctic Peninsula on 17 November 1820. This event occurred after earlier sightings by Russian and British explorers, though Palmer's specific sighting of the peninsula region remains a distinct historical milestone.

Priority Claims. Historical priority for the first sighting of Antarctica is contested. Fabian von Bellingshausen is credited as the first to see the land on 27 January 1820. Edward Bransfield sighted the Trinity Peninsula on 30 January 1820. Palmer's sighting on 17 November 1820 was ten months later. Historian A. Jones concluded Bellingshausen was the true discoverer, correcting the legacy claim that Palmer was the third person to see Antarctica.

Palmer's Sighting. Palmer and his crew became the first Americans to discover the Antarctic Peninsula. His sighting occurred on 17 November 1820, ten months after Bellingshausen's ice shelf sighting and three days after Bransfield's land sighting. Palmer explored the region, which later bore his name as Palmer Land, during his sealing expedition on the sloop Hero.