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Southern Hemisphere

Half of Earth that is south of the Equator

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Southern Hemisphere of Earth (Lambert Azimuthal projection), with national borders added
Sean Baker ( Marvin01 | talk ) · CC BY 2.0

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Through Hemispheres of Earth, Earth and South

Owing to the tilt of Earth's rotation relative to the Sun and the ecliptic plane, summer is from December to February (inclusive) and winter is from June to August (inclusive). September 22 or 23 is the vernal equinox and March 20 or 21 is the autumnal equinox. The South Pole is in the centre of the southern hemispherical region.

Characteristics

Southern Hemisphere climates tend to be slightly milder than those at similar latitudes in the Northern Hemisphere, except in the Antarctic which is colder than the Arctic. This is because the Southern Hemisphere has significantly more ocean and much less land; water heats up and cools down more slowly than land. The differences are also attributed to oceanic heat transfer and differing extents of greenhouse trapping.

Antarctica's Vostok Station holds the record for the Southern Hemisphere's lowest temperature at −89.2 °C (−128.6 °F) on July 21, 1983. This is also the lowest temperature ever recorded on earth. The lowest temperature ever recorded in the Northern Hemisphere was a −69.6°C (−93.3°F) reading at the Klinck Automatic Weather Station in Greenland on December 22, 1991. The Southern Hemisphere's highest recorded temperature is tied at 50.7 °C (123.3 °F) between Oodnadatta, South Australia on January 2, 1960 and Onslow, Western Australia on January 13, 2022. Globally, a 1922 reading of 58 °C (136.4 °F) in El Azizia, Libya, was long cited as the world record before the World Meteorological Organization decertified it in 2012 due to measurement errors. The 56.7°C (134°F) temperature recorded in Death Valley, California on July 10, 1913 replaced the invalidated Libya record.

In the Southern Hemisphere, the Sun passes from east to west through the north, although north of the Tropic of Capricorn the mean Sun can be directly overhead or due south at midday. The Sun follows a right-to-left trajectory through the northern sky unlike the left-to-right motion of the Sun when seen from the Northern Hemisphere as it passes through the southern sky. Sun-cast shadows turn anticlockwise throughout the day and sundials have the hours increasing in the anticlockwise direction. During solar eclipses viewed from a point to the south of the Tropic of Capricorn, the Moon moves from left to right on the disc of the Sun (see, for example, photos with timings of the solar eclipse of November 13, 2012), while viewed from a point to the north of the Tropic of Cancer (i.e., in the Northern Hemisphere), the Moon moves from right to left during solar eclipses.

The Coriolis effect causes cyclones and tropical storms to spin clockwise in the Southern Hemisphere, as opposed to anticlockwise in the Northern Hemisphere.

The southern temperate zone, a subsection of the Southern Hemisphere, is nearly all oceanic.

The Sagittarius constellation that includes the galactic centre is a southern constellation as well as both Magellanic Clouds. This, combined with clearer skies, makes for excellent viewing of the night sky from the Southern Hemisphere with brighter and more numerous stars.

The Southern Hemisphere has significantly less polluted air than the Northern Hemisphere. This is because most of earth's population and major industrial powers reside in the Northern Hemisphere, including high-emission countries like China and India. The Southern Hemisphere was unimpacted by the 1986 Chernobyl nuclear disaster, which at the time posed a serious threat to the Northern Hemisphere, and which continues to impact certain parts of Europe. Small traces of radiation from the disaster were found in far off Northern Hemisphere locations like the United States, Canada and Japan, but there were no traces of radiation at all in the Southern Hemisphere.

Flora and Fauna

Forests in the Southern Hemisphere have special features which set them apart from those in the Northern Hemisphere. Both Chile and Australia share, for example, unique beech species or Nothofagus, and New Zealand has members of the closely related genera Lophozonia and Fuscospora. The eucalyptus is native to Australia but is now also planted in Southern Africa and Latin America for pulp production, and increasingly, biofuel uses.

Some African animals like chimpanzees and gorillas live in both the Northern and Southern Hemisphere portions of Africa. Eastern gorillas are native to three Southern Hemisphere countries; Rwanda (which is entirely below the equator) and the Democratic Republic of the Congo and Uganda (which are trans-hemispheric countries). Western gorillas, meanwhile, can be found in Angola, the Democratic Republic of the Congo, Equatorial Guinea, Gabon and the Republic of the Congo, in addition to being found in the Northern Hemisphere countries Cameroon and Nigeria. The different species of chimpanzees have a much wider distribution across Africa. The common chimpanzee occurs in both hemispheres, ranging from the Northern Hemisphere countries of Guinea and Senegal in the west to Tanzania and Uganda in the east. Aside from the population in Tanzania and Uganda, populations in several countries lay partly or wholly south of the equator, including in Burundi, the Democratic Republic of the Congo, Gabon and Republic of the Congo. The bonobo, which is a distinct species from the common chimpanzee, is exclusive to the Southern Hemisphere. It is endemic to forests of the Democratic Republic of the Congo south of the Congo River. Conversely, the western chimpanzee subspecies of the common chimpanzee is confined to West Africa and the Northern Hemisphere. Its present range lies entirely north of the equator, including Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Senegal and Sierra Leone.

Giraffes occur predominantly in the Southern Hemisphere, with substantial populations in countries such as Botswana, Namibia, South Africa, Tanzania, Zambia, and Zimbabwe, although some populations also extend into the Northern Hemisphere, including parts of Kenya (which straddles the equator), Ethiopia and South Sudan. Zebras show a similar pattern: the plains zebra occurs in certain areas of the Horn of Africa in the Northern Hemisphere, and southward to Kenya, Tanzania, Zambia, Malawi, Mozambique and much of far southern Africa. When compared to the plains zebra, the mountain zebra and Grévy's zebra species have more geographically restricted distributions. Plains zebras used to occur in the far southern African country of Lesotho, but have since gone extinct there, in addition to going extinct in the Southern Hemisphere country Burundi, which is much further north of Lesotho.

The spectacled bear is the only bear species which occurs in the Southern Hemisphere. It is found in certain South American countries like Bolivia, Ecuador and Peru. One of the most notable animals to be found almost exclusively in the Southern Hemisphere is the penguin. A species is found around Isabela Island on the Galápagos archipelago in the Pacific Ocean, which straddles the equator. However, most of Isabela and the rest of the archipelago is located in the Southern Hemisphere, and it is deemed by the International Hydrographic Organization as being wholly within the South Pacific Ocean, rather than the North Pacific.

Australia and Madagascar developed many endemic animals due to their geological isolation, including kangaroos, koalas, platypuses, Tasmanian devils, emus, echidnas, quokkas, cassowaries, lemurs, aye-ayes, fossas, indris, sifakas and panther chameleons. These animals are all native to the Southern Hemisphere, by virtue of being endemic to Australia or Madagascar, with cassowaries and echidnas being found not only in Australia but also in neighboring New Guinea. Dodos were endemic to the formerly uninhabited island of Mauritius, which is located in the Indian Ocean and Southern Hemisphere. The animal went extinct in 1681, 170 years after the first documented human landing on the island. Several domestic dog breeds were developed in the Southern Hemisphere, including Australian cattle dogs, Australian kelpies, Australian silky terriers, Australian terriers, Bardino Majoreros, Brazilian terriers, Bull Arabs, Chilean terriers, Cimarrón Uruguayos, Cordoba fighting dogs, Dogo Argentinos, Fila Brasileiros, Pampas deerhounds, Peruvian Inca orchids and Tenterfield terriers. The Dogo Argentino and Fila Brasileiro are among the most widely banned dog breeds in the world, along with the Japanese Tosa Inu. The New Guinea singing dog naturally occurs on the island of New Guinea, rather than being an intentionally developed breed.

33 kilometers from Brazil's Atlantic coast lies Ilha da Queimada Grande, an island commonly known as "Snake Island" due to its large population of venomous snakes. The island is the only known natural habitat of the golden lancehead, a highly venomous species of pit viper. Earlier popular estimates claimed hundreds of thousands of snakes, but systematic studies have produced much lower estimates, with several thousand golden lancehead inhabiting the island. The unusually high concentration is thought to have developed after the island became separated from the mainland, leaving the snake population isolated while providing a relatively predator-poor environment and a seasonal supply of migratory birds; adult golden lanceheads feed primarily on birds, particularly the Chilean elaenia and yellow-legged thrush.

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