Circumnavigation in the context of "Magellan expedition"

Spherical Earth or Earth's curvature refers to the approximation of the figure of the Earth as a sphere. The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of Earth as a physical fact and calculated the Earth's circumference. This knowledge was gradually adopted throughout the Old World during Late Antiquity and the Middle Ages, displacing earlier beliefs in a flat Earth. A practical demonstration of Earth's sphericity was achieved by Ferdinand Magellan and Juan Sebastián Elcano's circumnavigation (1519–1522).

The realization that the figure of the Earth is more accurately described as an ellipsoid dates to the 17th century, as described by Isaac Newton in Principia. In the early 19th century, the flattening of the earth ellipsoid was determined to be of the order of 1/300 (Delambre, Everest). The modern value as determined by the US DoD World Geodetic System since the 1960s is close to 1/298.25. The scientific study of the shape of the Earth is known as geodesy.

Ferdinand Magellan (c. 1480 – 27 April 1521) was a Portuguese explorer best known for planning and leading the 1519–22 Spanish expedition to the East Indies. During this expedition, he discovered the Strait of Magellan, performed the first European crossing of the Pacific Ocean, and made the first known European contact with the Philippines. Magellan himself was killed in battle in the Philippines in 1521, but his crew, commanded by Spanish navigator Juan Sebastián Elcano, completed the return trip to Spain in 1522, achieving the first circumnavigation of Earth in history.

Born around 1480 into a family of minor Portuguese nobility, Magellan became a skilled sailor and naval officer in the service of the Portuguese Crown in Asia. However, King Manuel I refused to support Magellan's plan to reach the Moluccas, or Spice Islands, by sailing westwards around the American continent. Magellan then proposed the same plan to King Charles I of Spain, who approved it. In Seville, he married, fathered two children, and organized the expedition. In 1518, for his allegiance to the Hispanic monarchy, Magellan was appointed an admiral of the Spanish fleet and given command of the expedition—the five-ship "Armada of Molucca." He also was made a Commander of the Order of Santiago, one of the highest military ranks of the Spanish Empire.

Juan Sebastián Elcano (Elkano in modern Basque; also known as del Cano; 1486/1487 – 4 August 1526) was a Spanish navigator, ship-owner and explorer of Basque origin, best known for having completed the first circumnavigation of the Earth in the Spanish ship Victoria on the Magellan expedition to the Spice Islands. He received recognition for his achievement by Charles I of Spain with a coat of arms bearing a globe and the Latin motto Primus circumdedisti me (You were the first to circumnavigate me).

Despite his achievements, information on Elcano is scarce and he is the subject of great historiographical controversy, because of the scarcity of original sources which illuminate his private life and personality. Even in Spain, for example, the first biographies about him were written in the second half of the 19th century, after three centuries of neglect by historians.

The second voyage of HMS Beagle, from 27 December 1831 to 2 October 1836, was the second survey expedition of HMS Beagle, made under her newest commander, Robert FitzRoy. FitzRoy had thought of the advantages of having someone onboard who could investigate geology, and sought a naturalist to accompany them as a supernumerary. At the age of 22, the graduate Charles Darwin hoped to see the tropics before becoming a parson, and accepted the opportunity. He was greatly influenced by reading Charles Lyell's Principles of Geology during the voyage. By the end of the expedition, Darwin had made his name as a geologist, and fossil collector, and the publication of his journal (later known as The Voyage of the Beagle) gave him wide renown as a writer.

Beagle sailed across the Atlantic Ocean, and then carried out detailed hydrographic surveys around the coasts of southern South America, returning via Tahiti and Australia, after having circumnavigated the Earth. The initial offer to Darwin told him the voyage would last two years; it lasted almost five.

In aeronautics, a balloon is an unpowered aerostat, which remains aloft or floats due to its buoyancy. It may use hot air as a lifting gas, or it may use gas that is not air like hydrogen or helium. A balloon may be free, moving with the wind, or tethered to a fixed point. It is distinct from an airship, which is a powered aerostat that can propel itself through the air in a controlled manner.

Many balloons have a basket, gondola, or capsule suspended beneath the main envelope for carrying people or equipment (including cameras and telescopes, and flight-control mechanisms).

Victoria or Nao Victoria (Spanish for "Victory") was a carrack famed as the first ship to successfully circumnavigate the world. Victoria was part of the Spanish expedition to the Moluccas (now Indonesia's Maluku Islands) commanded by the explorer Ferdinand Magellan.

The carrack (Spanish: nao) was built at a Spanish shipyard in Ondarroa. Along with the four other ships, she was given to Magellan by King Charles I of Spain (later Emperor Charles V of the Holy Roman Empire). Victoria was an 85-tonel ship with an initial crew of about 42. The expedition's flagship and Magellan's own command was the carrack Trinidad. The other ships were the carrack San Antonio [es], the carrack Concepción, and the caravel Santiago [es].

This is a list of circumnavigations of Earth. Sections are ordered by ascending date of completion.