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Climata
The climes (singular ''clime''; also ''clima'', plural ''climata'', from Greek κλίμα ''klima'', plural κλίματα ''klimata'', meaning "inclination" or "slope") in classical Greco-Roman geography and Hellenistic astronomy, astronomy were the divisions of the Ecumene, inhabited portion of the spherical Earth by geographic latitude. Starting with Aristotle (''Meteorology'' 2.5,362a32), the Earth was divided into five zones, assuming two ''frigid'' climes (the Arctic and Antarctic) around the poles, an uninhabitable ''torrid'' clime near the equator, and two ''temperate'' climes between the frigid and the torrid ones. Different lists of climata were in use in Hellenistic period, Hellenistic and Roman period, Roman time. Claudius Ptolemy was the first ancient scientist known to have devised the so-called system of seven climes (Almagest 2.12) which, due to his authority, became one of the canonical elements of late antique, medieval European and Arab geography. In Mi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptolemy
Claudius Ptolemy (; , ; ; – 160s/170s AD) was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of which were important to later Byzantine science, Byzantine, Islamic science, Islamic, and Science in the Renaissance, Western European science. The first was his astronomical treatise now known as the ''Almagest'', originally entitled ' (, ', ). The second is the ''Geography (Ptolemy), Geography'', which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian physics, Aristotelian natural philosophy of his day. This is sometimes known as the ' (, 'On the Effects') but more commonly known as the ' (from the Koine Greek meaning 'four books'; ). The Catholic Church promoted his work, which included the only mathematically sound geocentric model of the Sola ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astronomy In The Medieval Islamic World
Medieval Islamic astronomy comprises the astronomical developments made in the Islamic world, particularly during the Islamic Golden Age (9th–13th centuries), and mostly written in the Arabic language. These developments mostly took place in the Middle East, Central Asia, Al-Andalus, and North Africa, and later in the Far East and India. It closely parallels the genesis of other Islamic sciences in its assimilation of foreign material and the amalgamation of the disparate elements of that material to create a science with Islamic characteristics. These included Greek, Sassanid, and Indian works in particular, which were translated and built upon. Islamic astronomy played a significant role in the revival of ancient astronomy following the loss of knowledge during the early medieval period, notably with the production of Latin translations of Arabic works during the 12th century. A significant number of stars in the sky, such as Aldebaran, Altair and Deneb, and astrono ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eritrea
Eritrea, officially the State of Eritrea, is a country in the Horn of Africa region of East Africa, with its capital and largest city being Asmara. It is bordered by Ethiopia in the Eritrea–Ethiopia border, south, Sudan in the west, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has a total area of approximately , and includes the Dahlak Archipelago and several of the Hanish Islands. Hominid remains found in Eritrea have been dated to 1 million years old and anthropological research indicates that the area may contain significant records related to the evolution of humans. The Kingdom of Aksum, covering much of modern-day Eritrea and Tigray Region, northern Ethiopia, was established during the first or second century AD.Henze, Paul B. (2005) ''Layers of Time: A History of Ethiopia'', . It adopted Eritrean Orthodox Church, Christianity around the middle of the fourth century. Beginning in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adulis
Adulis (Sabaic, Sabaean: 𐩱 𐩵 𐩡 𐩪, , ) was an ancient city along the Red Sea in the Gulf of Zula, about south of Massawa. Its ruins lie within the modern Eritrean list of cities in Eritrea, city of Zula. It was the emporium (antiquity), emporium considered part of the D’mt and the Kingdom of Aksum. It was close to Ancient Greece, Greece and the Byzantine Empire, with its luxury goods and trade routes. Its location can be included in the area known to the ancient Egyptians as the Land of Punt, perhaps coinciding with the locality of ''Wddt'', recorded in the geographical list of the Eighteenth Dynasty of Egypt. History Archeological excavations conducted at Adulis unearthed the existence of a late prehistoric settlement beneath the town, dating from the mid-2nd to early 1st millennium BCE. Adulis may correspond to ''Wddt'', a region recorded in the geographical lists of Egypt’s 18th dynasty (ca. 1450 BCE) as part of the Land of Punt. Pliny the Elder is the earlies ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Somalia
Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, the Gulf of Aden to the north, and the Indian Ocean to the east. Somalia has the longest coastline on Africa's mainland. Somalia has an estimated population of 18.1 million, of which 2.7 million live in the capital and largest city, Mogadishu. Around 85% of Somalia's residents are ethnic Somali people, Somalis. The official languages of the country are Somali language, Somali and Arabic, though Somali is the Languages of Somalia, primary language. Somalia has historic and religious ties to the Arab world. The people in Somalia are mainly Muslims, following the Sunni Islam, Sunni branch.. In antiquity, Somalia was an important commercial center. During the Middle Ages, several powerful Somali empires dominated the regional trade, including th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saylac
Zeila (, ), also known as Zaila or Zayla, is a historical port town in the western Awdal region of Somaliland. In the Middle Ages, the Jewish traveller Benjamin of Tudela identified Zeila with the Biblical location of Havilah. Most modern scholars identify it with the site of Avalites mentioned in the 1st-century Greco-Roman travelogue the ''Periplus of the Erythraean Sea'' and in Ptolemy, although this is disputed. The town evolved into an early Islamic center with the arrival of Muslims shortly after the Hijrah. By the 9th century, Zeila was the capital of the early Adal Kingdom and Ifat Sultanate in the 13th century, it would attain its height of prosperity a few centuries later in the 16th century. The city subsequently came under Ottoman and British protection in the 18th century. Up until recently Zeila was surrounded by a large wall with five gates: Bab al Sahil and Bab al-jadd on the North. Bab Abdulqadir on the East: Bab al-Sahil on the west and Bab Ashurbura on the so ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Avalites
Avalites (also spelled Abalitês, from or ) was an ancient port city in present-day Somalia. It corresponds with what later became the city of Zeila. According to the ''Periplus of the Erythraean Sea'', Avalites was located on the Far-Side market south of Adulis, stood near the entrance of the Red Sea, where the Gulf narrowed at the straits of Bab-el-Mandeb. The port city has been identified with modern day Zeila. Avalites exported spices, some ivory and a little myrrh, but the Periplus claims, better products could be obtained elsewhere. Some of these exports were transported on small crafts navigated by local people of the area and was shipped to Arabian port cities on the other side of the Red Sea. The Somali coast was an important part of the global incense trade, alongside Southeast Asia, South Asia, and southern Arabia on the Red Sea. Incense was widely used in the Mediterranean region and all of Europe, used for religious and everyday purposes. This made incense a notew ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sri Lanka
Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, Indian peninsula by the Gulf of Mannar and the Palk Strait. It shares a maritime border with the Maldives in the southwest and India in the northwest. Sri Jayawardenepura Kotte is the legislative capital of Sri Lanka, while the largest city, Colombo, is the administrative and judicial capital which is the nation's political, financial and cultural centre. Kandy is the second-largest urban area and also the capital of the last native kingdom of Sri Lanka. The most spoken language Sinhala language, Sinhala, is spoken by the majority of the population (approximately 17 million). Tamil language, Tamil is also spoken by approximately five million people, making it the second most-spoken language in Sri Lanka. Sri Lanka has a population of appr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Taprobana
Taprobana (; ), Trapobana, and Taprobane (, ) was the name by which the Indian Ocean island of Sri Lanka was known to the Ancient Greece, ancient Greeks. Tabrobane is suggested to be derived from Sanskrit "Tamraparni". This name could be a reference to the "copper colored" shores of Sri Lanka, and may have entered Greek via the Sinhala language, Sinhalese and/or the Pali language, Pali "Tambapanni". History Reports of the island's existence were known before the time of Alexander the Great as inferred from Pliny the Elder, Pliny. The treatise ''On the Universe, De Mundo'', supposedly by Aristotle (died 322 BC) but according to others by Chrysippus, Chrysippus the Stoic (280 to 208 BC), incorrectly states that the List of islands by area, island is as large as Great Britain (in fact, it is only about one third as big). The name was first reported to Europeans by the Greek geographer Megasthenes around 290 BC. Herodotus (444 BC) does not mention the island. The first Geograph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sunrise Equation
The sunrise equation or sunset equation can be used to derive the time of sunrise or sunset for any solar declination and latitude in terms of local solar time when sunrise and sunset actually occur. Formulation It is formulated as: :\cos \omega_\circ = -\tan \phi \times \tan \delta where: :\omega_\circ is the solar hour angle at either sunrise (when negative value is taken) or sunset (when positive value is taken); :\phi is the latitude of the observer on the Earth; :\delta is the sun declination. Principles The Earth rotates at an angular velocity of 15°/hour. Therefore, the expression \omega_\circ / \mathrm^\circ, where \omega_\circ is in degree, gives the interval of time in hours from sunrise to local solar noon or from local solar noon to sunset. The sign convention is typically that the observer latitude \phi is 0 at the equator, positive for the Northern Hemisphere and negative for the Southern Hemisphere, and the solar declination \delta is 0 at the vernal a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
