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65 (number)
65 (sixty-five) is the natural number following 64 and preceding 66. In mathematics Sixty-five is the 23rd semiprime and the 3rd of the form (5.q). It is an octagonal number. It is also a Cullen number. Given 65, the Mertens function returns 0. This number is the magic constant of a 5x5 normal magic square: \begin 17 & 24 & 1 & 8 & 15 \\ 23 & 5 & 7 & 14 & 16 \\ 4 & 6 & 13 & 20 & 22 \\ 10 & 12 & 19 & 21 & 3 \\ 11 & 18 & 25 & 2 & 9 \end. This number is also the magic constant of n-Queens Problem for n = 5. 65 is the smallest integer that can be expressed as a sum of two distinct positive squares in two ways, 65 = 82 + 12 = 72 + 42. It appears in the Padovan sequence, preceded by the terms 28, 37, 49 (it is the sum of the first two of these). There are only 65 known Euler's idoneal numbers. 65 is a Stirling number of the second kind, the number of ways of dividing a set of six objects into four non-empty subsets. 65 = 15 + 24 + 33 + 42 + 51. 65 is the length ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Natural Number
In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal numbers'', and numbers used for ordering are called ''ordinal numbers''. Natural numbers are sometimes used as labels, known as '' nominal numbers'', having none of the properties of numbers in a mathematical sense (e.g. sports jersey numbers). Some definitions, including the standard ISO 80000-2, begin the natural numbers with , corresponding to the non-negative integers , whereas others start with , corresponding to the positive integers Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). The natural numbers form a set. Many other number sets are built by succ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terbium
Terbium is a chemical element with the symbol Tb and atomic number 65. It is a silvery-white, rare earth metal that is malleable, and ductile. The ninth member of the lanthanide series, terbium is a fairly electropositive metal that reacts with water, evolving hydrogen gas. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite. Swedish chemist Carl Gustaf Mosander discovered terbium as a chemical element in 1843. He detected it as an impurity in yttrium oxide, . Yttrium and terbium, as well as erbium and ytterbium, are named after the village of Ytterby in Sweden. Terbium was not isolated in pure form until the advent of ion exchange techniques. Terbium is used to dope calcium fluoride, calcium tungstate and strontium molybdate in solid-state devices, and as a crystal stabilizer of fuel cells that operate at elevated temperatures. As a component of Terfenol-D (an alloy that exp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
65daysofstatic
65daysofstatic (often abbreviated as 65dos, 65days, or simply 65) are a post-rock band from Sheffield, England. Formed in 2001, the band is composed of instrumentalists Paul Wolinski, Joe Shrewsbury, Rob Jones and Simon Wright. The band's music has been described as noisy, electronic, guitar-driven instrumentals, interspersed with live drums and off-beat sampled drums akin to those of IDM artists, although they have continued to evolve their sound by incorporating electronic music, drum and bass and glitch music. They have been described as, "a soundtrack to a new dimension, where rock, dance and electronica are equals." The band's first album, ''The Fall of Math'', was released in September 2004, to critical acclaim, described as "an album that can retain the dynamics, fraught tension and climactic explosiveness of its peers and influences, whilst still sounding like one of the most urgent and direct long-player releases of the year." The band released a further five st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sammy Hagar
Samuel Roy Hagar (born October 13, 1947), also known as the Red Rocker, is an American singer, songwriter, and guitarist. He rose to prominence in the early 1970s with the hard rock band Montrose and subsequently launched a successful solo career, scoring a hit in 1984 with " I Can't Drive 55". He enjoyed commercial success when he replaced David Lee Roth as the second lead vocalist of Van Halen in 1985, but left in 1996. He returned to the band from 2003 to 2005. In 2007, Hagar was inducted into the Rock and Roll Hall of Fame as a member of Van Halen. His musical style primarily consists of hard rock and heavy metal. Also a businessman, Hagar founded the Cabo Wabo tequila brand and restaurant chain, as well as Sammy's Beach Bar rum. His current musical projects include being the lead singer of Chickenfoot and Sammy Hagar and the Circle. Hagar also is the host of '' Rock & Roll Road Trip with Sammy Hagar'' on AXS TV. Early life Sam Roy Hagar was born to Bobby and Gladys Ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
65 Love Affair
"65 Love Affair" is a song performed by Paul Davis on his album '' Cool Night''. Background This song marked Davis's second single release upon his departure from Bang Records to Arista, the first being " Cool Night". The style of "65 Love Affair" was reminiscent of such blue-eyed soul groups as Hall & Oates, a vein that Davis had not explored before. Davis had originally titled the song "'55 Love Affair", but Arista felt that some modernization was needed to target an audience whose teenage years had occurred in the 1960s, including Davis himself. As Arista pointed out, Davis was only 7 years old in 1955, too young for a "love affair", but was 17 years old in 1965, perfect for the song. Davis's previous hits had been country-oriented or ballads. The format change to pop proved to be quite marketable. "65 Love Affair" and "Cool Night", which were recorded at the same time, ranked first and third in terms of his Hot 100 peaks (" I Go Crazy" ranked second). In spite of this pop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cetus
Cetus () is a constellation, sometimes called 'the whale' in English. The Cetus was a sea monster in Greek mythology which both Perseus and Heracles needed to slay. Cetus is in the region of the sky that contains other water-related constellations: Aquarius, Pisces and Eridanus. Features Ecliptic Cetus is not among the 12 true zodiac constellations in the J2000 epoch, nor classical 12-part zodiac. The ecliptic passes less than 0.25° from one of its corners. Thus the moon and planets will enter Cetus (occulting any stars as a foreground object) in 50% of their successive orbits briefly and the southern part of the sun appears in Cetus for about one day each year. Many asteroids in belts have longer phases occulting the north-western part of Cetus, those with a slightly greater inclination to the ecliptic than the moon and planets. As seen from Mars, the ecliptic (apparent plane of the sun and also the average plane of the planets which is almost the same) passes into it. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spiral Galaxy
Spiral galaxies form a class of galaxy originally described by Edwin Hubble in his 1936 work ''The Realm of the Nebulae''Alt URL pp. 124–151) and, as such, form part of the . Most spiral galaxies consist of a flat, rotating disk containing s, gas and dust, and a central concentration of stars known as the |
NGC 65
NGC 65 (ESO 473-10A/PGC 1229) is a lenticular galaxy in the constellation Cetus. Its apparent magnitude is 13.4. It was first discovered in 1886, and is also known as PGC 1229. See also * List of NGC objects * List of galaxies * New General Catalogue References External links * Astronomical objects discovered in 1886, ? Cetus (constellation) Lenticular galaxies ESO objects, 473-10A MCG objects, -04-02-001 NGC objects, 0065 Principal Galaxies Catalogue objects, 01229 {{lenticular-galaxy-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New General Catalogue
The ''New General Catalogue of Nebulae and Clusters of Stars'' (abbreviated NGC) is an astronomical catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888. The NGC contains 7,840 objects, including galaxies, star clusters and emission nebulae. Dreyer published two supplements to the NGC in 1895 and 1908, known as the ''Index Catalogues'' (abbreviated IC), describing a further 5,386 astronomical objects. Thousands of these objects are best known by their NGC or IC numbers, which remain in widespread use. The NGC expanded and consolidated the cataloguing work of William and Caroline Herschel, and John Herschel's '' General Catalogue of Nebulae and Clusters of Stars''. Objects south of the celestial equator are catalogued somewhat less thoroughly, but many were included based on observation by John Herschel or James Dunlop. The NGC contained multiple errors, but attempts to eliminate them were made by the ''Revised New General Catalogue'' (RNGC) by Jack W. Su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leo (constellation)
Leo is one of the constellations of the zodiac, between Cancer the crab to the west and Virgo the maiden to the east. It is located in the Northern celestial hemisphere. Its name is Latin for lion, and to the ancient Greeks represented the Nemean Lion killed by the mythical Greek hero Heracles meaning 'Glory of Hera' (known to the ancient Romans as Hercules) as one of his twelve labors. Its old astronomical symbol is (♌︎). One of the 48 constellations described by the 2nd-century astronomer Ptolemy, Leo remains one of the 88 modern constellations today, and one of the most easily recognizable due to its many bright stars and a distinctive shape that is reminiscent of the crouching lion it depicts. The lion's mane and shoulders also form an asterism known as "The Sickle," which to modern observers may resemble a backwards "question mark." Features Stars Leo contains many bright stars, many of which were individually identified by the ancients. There are four stars of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Constellation
A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the earliest constellations likely go back to prehistory. People used them to relate stories of their beliefs, experiences, creation, or mythology. Different cultures and countries adopted their own constellations, some of which lasted into the early 20th century before today's constellations were internationally recognized. The recognition of constellations has changed significantly over time. Many changed in size or shape. Some became popular, only to drop into obscurity. Some were limited to a single culture or nation. The 48 traditional Western constellations are Greek. They are given in Aratus' work ''Phenomena'' and Ptolemy's '' Almagest'', though their origin probably predates these works by several centuries. Constellations in the far southern sky were ad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Visual Magnitude
Apparent magnitude () is a measure of the brightness of a star or other astronomical object observed from Earth. An object's apparent magnitude depends on its intrinsic luminosity, its distance from Earth, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer. The word ''magnitude'' in astronomy, unless stated otherwise, usually refers to a celestial object's apparent magnitude. The magnitude scale dates back to the ancient Roman astronomer Claudius Ptolemy, whose star catalog listed stars from 1st magnitude (brightest) to 6th magnitude (dimmest). The modern scale was mathematically defined in a way to closely match this historical system. The scale is reverse logarithmic: the brighter an object is, the lower its magnitude number. A difference of 1.0 in magnitude corresponds to a brightness ratio of \sqrt /math>, or about 2.512. For example, a star of magnitude 2.0 is 2.512 times as bright as a star of magnitude 3.0, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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