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Príncipe D
Príncipe (; ) is the smaller, northern major island of the country of São Tomé and Príncipe lying off the west coast of Africa in the Gulf of Guinea. It has an area of (including offshore islets) and a population of 7,324 at the 2012 Census;Projecção a nível distrital 2012 – 2020 Instituto Nacional de Estatística the latest official estimate (at May 2018) was 8,420.Instituto Nacional de Estatística. The island is a heavily eroded volcano speculated to b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John II Of Portugal
John II (; ; 3 May 1455 – 25 October 1495), called the Perfect Prince (), was King of Portugal from 1481 until his death in 1495, and also for a brief time in 1477. He is known for reestablishing the power of the Portuguese monarchy, reinvigorating the economy of Portugal, and renewing the Portuguese exploration of Africa and Asia. Early life Born in Lisbon on 3 May 1455, John was the second son of Afonso V of Portugal and Isabella of Coimbra. At one month old, on 25 June 1455, he was declared legitimate heir to the crown and received an oath of allegiance from the three estates. In 1468, Afonso V and Henry IV of Castile attempted to arrange a double marriage in which John would marry Henry's daughter, Joanna, and Afonso would marry Henry's half-sister and heir-presumptive, Isabella of Castile. However, Isabella refused to consent to the arrangement. Instead, John married Eleanor of Viseu, his first cousin and the eldest daughter of Ferdinand, Duke of Viseu, on 22 Janu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gulf Of Guinea
The Gulf of Guinea (French language, French: ''Golfe de Guinée''; Spanish language, Spanish: ''Golfo de Guinea''; Portuguese language, Portuguese: ''Golfo da Guiné'') is the northeasternmost part of the tropical Atlantic Ocean from Cape Lopez in Gabon, north and west to Cape Palmas in Liberia. Null Island, defined as the intersection of the Equator and Prime Meridian (zero degrees latitude and longitude), is in the gulf. Among the many rivers that drain into the Gulf of Guinea are the Niger River, Niger and the Volta River, Volta. The coastline on the gulf includes the Bight of Benin and the Bight of Bonny. Name "Guinea" is thought to have originated from a local name for an area in the region, although the specifics are disputed. Bovill (1995) gives a thorough description: The name "Guinea (region), Guinea" was also previously applied to the south coast of West Africa (north of the Gulf of Guinea), which became known as "Upper Guinea", and to the west coast of Southern Afri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Eclipse Of May 29, 1919
A total solar eclipse occurred at the Moon's descending node of orbit on Thursday, May 29, 1919, with a magnitude of 1.0719. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring only 19 hours after perigee (on May 28, 1919, at 18:09 UTC), the Moon's apparent diameter was larger. This specific total solar eclipse was significant because it helped prove Einstein's theory of relativity. The eclipse was the subject of the Eddington experiment: two groups of British astronomers went to Brazil and the west coast of Africa to take pictures of the stars in the sky once the Moon covere ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arthur Stanley Eddington
Sir Arthur Stanley Eddington, (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician. He was also a philosopher of science and a populariser of science. The Eddington limit, the natural limit to the luminosity of stars, or the radiation generated by accretion onto a compact object, is named in his honour. Around 1920, he foreshadowed the discovery and mechanism of nuclear fusion processes in stars, in his paper "The Internal Constitution of the Stars".The Internal Constitution of the Stars A. S. Eddington The Scientific Monthly Vol. 11, No. 4 (Oct., 1920), pp. 297–303 At that time, the source of stellar energy was a complete mystery; Eddington was the first to correctly speculate that the source was fusion of hydrogen into helium. Eddington wrote a number of articles that announced and explained Einstein's theory of general relativity to the English-speaking world. World War I had severed many lines of scientific communication, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theory Of Relativity
The theory of relativity usually encompasses two interrelated physics theories by Albert Einstein: special relativity and general relativity, proposed and published in 1905 and 1915, respectively. Special relativity applies to all physical phenomena in the absence of gravity. General relativity explains the law of gravitation and its relation to the forces of nature. It applies to the cosmological and astrophysical realm, including astronomy. The theory transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts including 4-dimensional spacetime as a unified entity of space and time, relativity of simultaneity, kinematic and gravitational time dilation, and length contraction. In the field of physics, relativity improved the science of elementary particles and their fundamental interactions, along with ushering in the nuclear age. With relativity, cosmolog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Albert Einstein
Albert Einstein (14 March 187918 April 1955) was a German-born theoretical physicist who is best known for developing the theory of relativity. Einstein also made important contributions to quantum mechanics. His mass–energy equivalence formula , which arises from special relativity, has been called "the world's most famous equation". He received the 1921 Nobel Prize in Physics for . Born in the German Empire, Einstein moved to Switzerland in 1895, forsaking his German citizenship (as a subject of the Kingdom of Württemberg) the following year. In 1897, at the age of seventeen, he enrolled in the mathematics and physics teaching diploma program at the Swiss ETH Zurich, federal polytechnic school in Zurich, graduating in 1900. He acquired Swiss citizenship a year later, which he kept for the rest of his life, and afterwards secured a permanent position at the Swiss Patent Office in Bern. In 1905, he submitted a successful PhD dissertation to the University of Zurich. In 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Portuguese São Tomé And Príncipe
Portuguese São Tomé and Príncipe or Portuguese Central Africa was a colony of the Portuguese Empire from the discovery of the islands in 1470 until 1975, when independence was granted by Portugal. History The Portuguese explorers João de Santarém and Pêro Escobar discovered the islands around 1470,Francisco, Agostinho, p.24 which they found uninhabited.Grivetti, Shapiro, p. 1849 São Tomé Island was named by the Portuguese in honor of Saint Thomas, as they discovered the island on his feast day, while the island of Príncipe (Prince's island) was named in honor of Afonso, Prince of Portugal, his father's favorite. The first attempt to settle the islands began in 1485, when the Portuguese Crown granted João de Paiva the island of São Tomé. However, this attempt was not successful because the settlers were unable to produce food in the specific conditions and climate that the islands offered, and because of the tropical diseases that affected the settlers. It was only ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Capital (political)
A capital city, or just capital, is the municipality holding primary status in a country, state, province, department, or other subnational division, usually as its seat of the government. A capital is typically a city that physically encompasses the government's offices and meeting places; the status as capital is often designated by its law or constitution. In some jurisdictions, including several countries, different branches of government are in different settlements, sometimes meaning multiple official capitals. In some cases, a distinction is made between the official ( constitutional) capital and the seat of government, which is in another place. English-language media often use the name of the capital metonymically to refer to the government sitting there. Thus, "London-Washington relations" is widely understood to mean diplomatic relations between Great Britain and the United States. Terminology and etymology The word ''capital'' derives from the Latin wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fortaleza De Santo António Da Ponta Da Mina
The Fortaleza de Santo António da Ponta da Mina or Forte de Ponta da Mina is a ruined fort located east of the island capital Santo António in the island of Príncipe in São Tomé and Príncipe. It is located at the headland Ponta da Mina. The fortress consisted of two parts: the Bateria Real and the Bateria do Príncipe. Heritage of Portuguese Influence The fort was built in 1695. In 1706, the city of was invaded by the French during the , destroying the town and its for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Theobroma Cacao
''Theobroma cacao'' (cacao tree or cocoa tree) is a small ( tall) evergreen tree in the Malvaceae family. Its seedscocoa beansare used to make chocolate liquor, cocoa solids, cocoa butter and chocolate. Although the tree is native to the tropics of the Americas, the largest producer of cocoa beans in 2022 was Ivory Coast. The plant's leaf, leaves are alternate, entire, unlobed, long and broad. Description Flowers The flowers are produced in clusters directly on the Trunk (botany), trunk and older branches; this is known as cauliflory. The flowers are small, diameter, with pink Calyx (botany), calyx. The floral formula, used to represent the structure of a flower using numbers, is ✶ K5 C5 A(5°+52) (5). While many of the world's flowers are pollinated by bees (Hymenoptera) or Butterfly, butterflies/moths (Lepidoptera), cacao flowers are pollinated by tiny flies, ''Forcipomyia'' biting midges. Using the natural pollinator ''Forcipomyia'' midges produced more fruit tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cane Sugar
Sucrose, a disaccharide, is a sugar composed of glucose and fructose subunits. It is produced naturally in plants and is the main constituent of white sugar. It has the molecular formula . For human consumption, sucrose is extracted and refined from either sugarcane or sugar beet. Sugar mills – typically located in tropical regions near where sugarcane is grown – crush the cane and produce raw sugar which is shipped to other factories for refining into pure sucrose. Sugar beet factories are located in temperate climates where the beet is grown, and process the beets directly into refined sugar. The sugar-refining process involves washing the raw sugar crystals before dissolving them into a sugar syrup which is filtered and then passed over carbon to remove any residual colour. The sugar syrup is then concentrated by boiling under a vacuum and crystallized as the final purification process to produce crystals of pure sucrose that are clear, odorless, and sweet. Sugar is of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slavery In Africa
Slavery has historically been widespread in Africa. Systems of servitude and slavery were once commonplace in parts of Africa, as they were in much of the rest of the Ancient history, ancient and Post-classical history, medieval world. When the trans-Saharan slave trade, Red Sea slave trade, Indian Ocean slave trade, and Atlantic slave trade (which started in the 16th century) began, many of the pre-existing local African slave systems began supplying captives for slave markets outside Africa. Slavery in contemporary Africa still exists in some regions despite being illegal. In the relevant literature African slavery is categorized into indigenous slavery and export slavery, depending on whether or not slaves were traded beyond the continent. Slavery in historical Africa was practised in many different forms: Debt slavery, enslavement of war captives, military slavery, slavery for prostitution, and enslavement of criminals were all practised in various parts of Africa. Slavery ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
