|
Oenopides
Oenopides of Chios (; born c. 490 BCE) was an ancient Greece, Greek geometer, astronomer and mathematician, who lived around 450 Common Era, BCE. Biography Only limited information is known about the early life of Oenopides, other than that his birthplace was the island of Chios around 490 BCE. It is believed that Oenopides spent time in Athens but there is only circumstantial evidence to support this. Plato mentions him in ''Erastae: A Dialogue On Philosophy'' which places him in Athens. The English translator of the same book reveals (in footnote 3) one other aspect in Oenopides life which was his travel in Egypt in which he enriched his knowledge in the art of Astronomy and Geometry by some Egyptian priests. Astronomy The main accomplishment of Oenopides as an astronomer was his determination of the angle between the plane of the celestial equator, and the zodiac (the yearly path of the Sun in the sky). He found this angle to be 24°. In effect this amounted to measuring ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chios
Chios (; , traditionally known as Scio in English) is the fifth largest Greece, Greek list of islands of Greece, island, situated in the northern Aegean Sea, and the List of islands in the Mediterranean#By area, tenth largest island in the Mediterranean Sea. The island is separated from Turkey by the Chios Strait. Chios is notable for its exports of Mastic (plant resin), mastic gum and its nickname is "the Mastic Island". Tourist attractions include its medieval villages and the 11th-century monastery of Nea Moni of Chios, Nea Moni, a UNESCO World Heritage Site. Administratively, the island forms a separate municipality within the Chios (regional unit), Chios regional unit, which is part of the North Aegean modern regions of Greece, region. The principal town of the island and seat of the municipality is Chios, North Aegean, Chios. Locals refer to Chios town as ''Chora'' ( literally means land or country, but usually refers to the capital or a settlement at the highest point of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saros (astronomy)
The saros () is a period of exactly 223 synodic months, 18 years 11 days and 8 hours, that can be used to predict eclipses of the solar eclipse, Sun and lunar eclipse, Moon. One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle. Every eclipse has an associated saros series and all succeeding or preceding eclipses have a different saros series associated with them - as the eclipse of the same series occurs or occurred with a gap of one saros only. Solar and lunar eclipses have different saros series. A series of eclipses that are separated by one saros is called a ''saros series''. It corresponds to: *6,585.321347 solar days *18.029 years *223 synodic months *241.999 draconic months *18.999 eclipse years (38 eclipse seasons of 173.31 days) *238.992 anomalistic months *241.029 sidereal months The 19 eclipse years means ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Year Of Death Unknown
A year is a unit of time based on how long it takes the Earth to orbit the Sun. In scientific use, the tropical year (approximately 365 solar days, 5 hours, 48 minutes, 45 seconds) and the sidereal year (about 20 minutes longer) are more exact. The modern calendar year, as reckoned according to the Gregorian calendar, approximates the tropical year by using a system of leap years. The term 'year' is also used to indicate other periods of roughly similar duration, such as the lunar year (a roughly 354-day cycle of twelve of the Moon's phasessee lunar calendar), as well as periods loosely associated with the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ancient Greek Geometers
Ancient history is a time period from the beginning of writing and recorded human history through late antiquity. The span of recorded history is roughly 5,000 years, beginning with the development of Sumerian cuneiform script. Ancient history covers all continents inhabited by humans in the period 3000 BCAD 500, ending with the expansion of Islam in late antiquity. The three-age system periodises ancient history into the Stone Age, the Bronze Age, and the Iron Age, with recorded history generally considered to begin with the Bronze Age. The start and end of the three ages vary between world regions. In many regions the Bronze Age is generally considered to begin a few centuries prior to 3000 BC, while the end of the Iron Age varies from the early first millennium BC in some regions to the late first millennium AD in others. During the time period of ancient history, the world population was exponentially increasing due to the Neolithic Revolution, which was in full prog ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
490s BC Births
49 may refer to: * 49 (number) * "Forty Nine", a song by Karma to Burn from the album '' V'', 2011 * one of the years 49 BC, AD 49, 1949, 2049 * 49 Pales 49 Pales () is a large, dark main-belt asteroid. It was discovered by German-French astronomer Hermann Goldschmidt on 19 September 1857 from his balcony in Paris. The asteroid is named after Pales, the goddess of shepherds in Roman mytholog ..., a main-belt asteroid * Tatra 49, a three-wheeled motor vehicle {{Numberdis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ivor Bulmer-Thomas
Ivor Bulmer-Thomas CBE FSA (30 November 1905 – 7 October 1993), born Ivor Thomas, was a British journalist and scientific writer who served eight years as a Member of Parliament (MP). His career was much influenced by his conversion to the Church of England in his youth, and he became a pious believer on the Anglo-Catholic wing of the Church. A brilliant scholar and champion athlete while at university, Bulmer-Thomas wrote biographies and worked as a sub-editor on ''The Times'' during his early life. His experience in wartime Italian propaganda led him to doubt its value. Serving in the Attlee Labour Party government in junior roles made him resent the influence of the Labour left; he fell out with party policy on nationalisation and moved to the Conservative Party. He was a workaholic and after leaving politics he became a leading layman in the Church of England; an interest in historic buildings led him to set up the Friends of Friendless Churches group, which campai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atreus
In Greek mythology, Atreus (, ) was a king of Mycenae in the Peloponnese, the son of Pelops and Hippodamia (daughter of Oenomaus), Hippodamia, and the father of Agamemnon and Menelaus. His descendants became known collectively as the Atreidae ( ''Atreidai''). Atreus and his twin brother Thyestes were exiled by their father for murdering their half-brother Chrysippus (mythology), Chrysippus in their desire for the throne of Olympia, Greece, Olympia. They took refuge in Mycenae, where they ascended to the throne in the absence of King Eurystheus, who was fighting the Heracleidae. Eurystheus had meant for their stewardship to be temporary, but it became permanent after his death in battle, which ended the rule of the Perseid dynasty in Mycenae. According to most ancient sources, Atreus was the father of Pleisthenes, but in some lyric poets (Ibycus, Bacchylides) Pleisthenides (son of Pleisthenes) is used as an alternative name for Atreus himself. Nomenclature 'Atreides' () is a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thyestes
In Greek mythology, Thyestes (pronounced , , ) was a king of Olympia. Thyestes and his brother, Atreus, were exiled by their father for having murdered their half-brother, Chrysippus, in their desire for the throne of Olympia. They took refuge in Mycenae, where they ascended the throne upon the absence of King Eurystheus, who was fighting the Heracleidae. Eurystheus had meant for their lordship to be temporary; it became permanent because of his death in conflict. The most popular representation of Thyestes is that of the play ''Thyestes'' by Seneca in 62 AD. This play is one of the originals for the revenge tragedy genre. Although inspired by Greek mythology and legend, Seneca's version is different. Family Thyestes was the son of Pelops and Hippodamia, and father of Pelopia and Aegisthus. His three sons by a naiad, who were killed by Atreus, were named Aglaus, Orchomenus and Calaeus. Myth Pelops and Hippodamia are parents to Thyestes. However, they were cursed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Milky Way
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the #Appearance, galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be individually distinguished by the naked eye. The Milky Way is a barred spiral galaxy with a Galaxy#Isophotal diameter, D25 isophotal diameter estimated at , but only about 1,000 light-years thick at the spiral arms (more at the bulge). Recent simulations suggest that a dark matter area, also containing some visible stars, may extend up to a diameter of almost 2 million light-years (613 kpc). The Milky Way has several List of Milky Way's satellite galaxies, satellite galaxies and is part of the Local Group of galaxies, forming part of the Virgo Supercluster which is itself a component of the Laniakea Supercluster. It is estimated to contain 100–400 billion stars and at least that number of pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Compass And Straightedge
In geometry, straightedge-and-compass construction – also known as ruler-and-compass construction, Euclidean construction, or classical construction – is the construction of lengths, angles, and other geometric figures using only an Idealization (science philosophy), idealized ruler and a Compass (drawing tool), compass. The idealized ruler, known as a straightedge, is assumed to be infinite in length, have only one edge, and no markings on it. The compass is assumed to have no maximum or minimum radius, and is assumed to "collapse" when lifted from the page, so it may not be directly used to transfer distances. (This is an unimportant restriction since, using a multi-step procedure, a distance can be transferred even with a collapsing compass; see compass equivalence theorem. Note however that whilst a non-collapsing compass held against a straightedge might seem to be equivalent to marking it, the neusis construction is still impermissible and this is what unmarked really ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Euctemon
Euctemon (, ''gen.'' Εὐκτήμωνος; fl. 432 BC) was an Athenian astronomer. He was a contemporary of Meton and worked closely with this astronomer. Little is known of his work apart from his partnership with Meton and what is mentioned by Ptolemy. With Meton, he made a series of observations of the solstices (the points at which the Sun is seen at the greatest distance from the equator) in order to determine the length of the tropical year. Geminus and Ptolemy quote him as a source on the rising and setting of the stars. Pausanias's ''Description of Greece'' names Damon and Philogenes as Euctemon's children. The lunar crater Lunar craters are impact craters on Earth's Moon. The Moon's surface has many craters, all of which were formed by impacts. The International Astronomical Union currently recognizes 9,137 craters, of which 1,675 have been dated. History The wo ... Euctemon is named after him. References External links *Greek Astronomy 5th-century BC At ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
