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Magellanic Clouds
The Magellanic Clouds (''Magellanic system'' or ''Nubeculae Magellani'') are two irregular dwarf galaxies in the southern celestial hemisphere. Orbiting the Milky Way galaxy, these satellite galaxies are members of the Local Group. Because both show signs of a bar structure, they are often reclassified as Magellanic spiral galaxies. The two galaxies are the following: * Large Magellanic Cloud (LMC), about away * Small Magellanic Cloud (SMC), about away The Magellanic Clouds are visible to the unaided eye from the Southern Hemisphere, but cannot be observed from the most northern latitudes. History They may be the objects mentioned by the polymath Ibn Qutaybah (d. 889 CE), in his book on ''Al-Anwā̵’'' (the stations of the Moon in pre-Islamic Arabian culture): وأسفل من سهيل قدما سهيل . وفى مجرى قدمى سهيل، من خلفهما كواكب زهر كبار، لا ترى بالعراق، يسميها أهل تهامة الأعبار And be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magellanic Clouds ― Irregular Dwarf Galaxies
Magellanic may refer to: *Magellanic Steppe, 7th largest desert in the world, see Patagonian Desert *Magellanic Straits, a sea passageway at the tip of South America, see Strait of Magellan *Magellanic subpolar forests, an ecoregion of southernmost Chile and Argentina *Magellanic Premium, a major prize established in 1786 regarding navigation Astronomy *Magellanic Clouds, two major Milky Way neighbouring galaxies, matter streams, or systems related to them: **Large Magellanic Cloud, a major satellite galaxy to the Milky Way **Small Magellanic Cloud, a smaller major satellite galaxy to the Milky Way ***Mini Magellanic Cloud, a sub-satellite galaxy separating from the Small Magellanic Cloud **Magellanic Bridge, a neutral hydrogen stream with a few stars linking the two Magellanic Clouds, with a density of stars midway known as OGLE Island **Magellanic Stream, a neutral hydrogen gas halo and star envelope around the two Magellanic Clouds linking them to the Milky Way *Magellanic spiral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magellanic Spiral
A Magellanic spiral galaxy is a spiral galaxy with only one spiral arm. Magellanic spiral galaxies are classified as the type Sm (with sub-categories SAm, SBm, SABm); the prototype galaxy and namesake for Magellanic spirals is the Large Magellanic Cloud, an SBm galaxy. They are usually smaller dwarf galaxies and can be considered to be intermediate between dwarf spiral galaxies and irregular galaxies. Magellanic spirals SAm galaxies are a type of unbarred spiral galaxy, while SBm are a type of barred spiral galaxy A barred spiral galaxy is a spiral galaxy with a central bar-shaped structure composed of stars. Bars are found in about two thirds of all spiral galaxies in the local universe, and generally affect both the motions of stars and interstellar gas .... Linda S. Sparke, John Sill Gallagher, ''Galaxies in the Universe: An Introduction'', 2ed., Cambridge University Press, 2007, SABm are a type of intermediate spiral galaxy. Type ''Sm'' and ''Im'' galaxies have a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argo Navis
Argo Navis (the Ship Argo), or simply Argo, is one of Ptolemy's 48 constellations, now a grouping of three IAU constellations. It is formerly a single large constellation in the southern sky. The genitive is "Argus Navis", abbreviated "Arg". John Flamsteed and other early modern astronomers called it Navis (the Ship), genitive "Navis", abbreviated "Nav". The constellation proved to be of unwieldy size, as it was 28% larger than the next largest constellation and had more than 160 easily visible stars. The 1755 catalogue of Nicolas Louis de Lacaille divided it into the three modern constellations that occupy much of the same area: Carina (the keel), Puppis (the poop deck or stern), and Vela (the sails). Argo derived from the ship '' Argo'' in Greek mythology, sailed by Jason and the Argonauts to Colchis in search of the Golden Fleece. Some stars of Puppis and Vela can be seen from Mediterranean latitudes in winter and spring, the ship appearing to skim along the "riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Book Of Fixed Stars
''The Book of Fixed Stars'' ( ', literally ''The Book of the Shapes of Stars'') is an Astronomy, astronomical text written by Abd al-Rahman al-Sufi (Azophi) around 964. Following Graeco-Arabic translation movement, the translation movement in the 9th century AD, the book was written in Arabic language, Arabic, the common language for scholars across the vast Islamic territories, although the author himself was Persian people, Persian. It was an attempt to create a synthesis of the comprehensive star catalogue in Ptolemy's ''Almagest'' (books VII and VIII) with the indigenous Arabic astronomical traditions on the constellations (notably the Arabic constellation system of the ''Anwā). The original manuscript no longer survives as an Autograph (manuscript), autograph; however, the importance of tradition and the practice of diligence central to Islamic manuscript tradition have ensured the survival of the ''Book of Stars'' in later-made copies. Historical context The treatise w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al Sufi
ʿAbd al-Raḥmān al-Ṣūfī (; 7 December 90325 May 986) was a Persian astronomer. His work '' '' ("''The Book of Fixed Stars''"), written in 964, included both textual descriptions and illustrations. The Persian polymath Al-Biruni wrote that al-Ṣūfī's work on the ecliptic was carried out in Shiraz. Al-Ṣūfī lived at the Buyid court in Isfahan. Biography ʿAbd al-Rahmān al-Ṣūfī (full name: Abū’l-Ḥusayn ʿAbd al-Raḥmān ibn ʿUmar ibn Sahl al-Ṣūfī al-Rāzī) was one of the nine famous Muslim astronomers. He lived at the court of Emir 'Adud al-Dawla in Isfahan, and worked on translating and expanding ancient Greek astronomical works, especially the ''Almagest'' of Ptolemy. He made corrections to Ptolemy's star list, and his estimations of star brightness and magnitude deviated from those by Ptolemy; just over half of al-Ṣūfī's magnitudes being identical to Ptolemy's. A Persian, al-Ṣūfī wrote in Arabic, the lingua franca of the scientific Muslim wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tihama
Tihamah or Tihama ( ') is the Red Sea coastal plain of the Arabian Peninsula from the Gulf of Aqaba to the Bab el Mandeb. Etymology Tihāmat is the Proto-Semitic language's term for 'sea'. Tiamat (or Tehom, in masculine form) was the ancient Mesopotamian god of the sea and of chaos. The word appears in the Hebrew Bible as təhōm (Genesis 1:2), meaning "primordial ocean, abyss". History Era of Muhammad During the era of the Islamic prophet Muhammad, many military expeditions took place here including the Battle of Hamra al-Asad and caravan raids. Beginning in January 623 CE, some of the Muslims resorted to the tradition of raiding the Meccan caravans that traveled along the eastern coast of the Red Sea from Mecca to the Syrian region. While at Ḥamra' al-Asad (), Muhammad made an agreement with Mabad al-Khuzaah at Tihamah, in which Mabad pledged not to conceal anything from him. Mabad was then sent to Mecca to dissuade Abu Sufyan ibn Harb from fighting. In Mecca, Mabad m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iraq
Iraq, officially the Republic of Iraq, is a country in West Asia. It is bordered by Saudi Arabia to Iraq–Saudi Arabia border, the south, Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq border, the east, the Persian Gulf and Kuwait to the Iraq–Kuwait border, southeast, Jordan to Iraq–Jordan border, the southwest, and Syria to Iraq–Syria border, the west. The country covers an area of and has Demographics of Iraq, a population of over 46 million, making it the List of countries by area, 58th largest country by area and the List of countries by population, 31st most populous in the world. Baghdad, home to over 8 million people, is the capital city and the List of largest cities of Iraq, largest in the country. Starting in the 6th millennium BC, the fertile plains between Iraq's Tigris and Euphrates rivers, referred to as Mesopotamia, fostered the rise of early cities, civilisations, and empires including Sumer, Akkadian Empire, Akkad, and Assyria. Known ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canopus
Canopus is the brightest star in the southern constellation of Carina (constellation), Carina and the list of brightest stars, second-brightest star in the night sky. It is also Bayer designation, designated α Carinae, which is Romanization, romanized (Transliteration, transliterated) to Alpha Carinae. With a visual apparent magnitude of −0.74, it is outshone only by Sirius. Located around from the Sun, Canopus is a bright giant of spectral type A9, so it is essentially white when seen with the naked eye. It has a luminosity over 10,000 times the luminosity of the Sun, is nine to ten times as mass of the Sun, massive, and has expanded to 71 times the Sun's radius. Its enlarged photosphere has an effective temperature of around . Canopus is undergoing stellar core, core helium fusion, helium burning and is currently in the so-called blue loop phase of its stellar evolution, evolution, having already passed through the red-giant branch after exhausting the h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pre-Islamic Arabia
Pre-Islamic Arabia is the Arabian Peninsula and its northern extension in the Syrian Desert before the rise of Islam. This is consistent with how contemporaries used the term ''Arabia'' or where they said Arabs lived, which was not limited to the peninsula. Pre-Islamic Arabia included both nomadic and settled populations. Several settled populations developed distinctive civilizations. From around the second half of the 2nd millennium BCE, South Arabia, Southern Arabia was the home to a number of kingdoms, such as the Sabaeans and the Minaeans, and Eastern Arabia was inhabited by Semitic-speaking peoples who presumably migrated from the southwest, such as the so-called Samad Late Iron Age, Samad population.Kenneth A. Kitchen The World of "Ancient Arabia" Series. Documentation for Ancient Arabia. Part I. Chronological Framework and Historical Sources p.110 From 106 CE to 630 CE, Arabia's most northwestern areas were controlled by the Roman Empire, which governed it as Arabia Petrae ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibn Qutaybah
Abū Muḥammad ʿAbd Allāh ibn Muslim ibn Qutayba al-Dīnawarī al-Marwazī better known simply as Ibn Qutaybah (; c. 828 – 13 November 889 CE/213 – 15 Rajab 276 AH) was an Islamic scholar of Persian people, Persian descent. He served as a qadi, judge during the Abbasid Caliphate, but was best known for his contributions to Arabic literature.Abd Allah Abu Muhammad Abd Allah ibn Muslim al-Dinwari Ibn Qutaybah from The Oxford Dictionary of Islam. Oxford Reference, Copyright © 2013.Christopher Melchert, "Qur'anic Abrogation Across the Ninth Century." Taken from ''Studies in Islamic Legal Theory'', pg. 80. Ed. Bernard G. Weiss. Volume 15 of Studies in Islamic law and society / Studies in Islamic law and society. Leiden: Brill Publishers, 2002. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polymath
A polymath or polyhistor is an individual whose knowledge spans many different subjects, known to draw on complex bodies of knowledge to solve specific problems. Polymaths often prefer a specific context in which to explain their knowledge, but some are gifted at explaining abstractly and creatively. Embodying a basic tenet of Renaissance humanism that humans are limitless in their capacity for development, the concept led to the notion that people should embrace all knowledge and develop their capacities as fully as possible. This is expressed in the term Renaissance man, often applied to the Intellectual giftedness, gifted people of that age who sought to develop their abilities in all areas of accomplishment: intellectual, artistic, social, physical, and spiritual. Etymology The word polymath derives from the Ancient Greek, Greek roots ''poly-'', which means "much" or "many," and ''manthanein'', which means "to learn." Plutarch wrote that the Ancient Greek Muses, muse P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the equator. For other planets in the Solar System, north is defined by humans as being in the same celestial sphere, celestial hemisphere relative to the invariable plane of the Solar System as Earth's North Pole. Due to Earth's axial tilt of 23.439281°, there is a seasonal variation in the lengths of the day and night. There is also a seasonal variation in temperatures, which lags the variation in day and night. Conventionally, winter in the Northern Hemisphere is taken as the period from the December solstice (typically December 21 UTC) to the March equinox (typically March 20 UTC), while summer is taken as the period from the June solstice through to the September equinox (typically on 23 September UTC). The dates vary each year due to the difference between the calendar year and the Year#Astronomical years, astronomical year. Within the Northern Hemisphere, oceanic currents can change the weather patterns that aff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
