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Ankara University Observatory
The Ankara University Observatory (AUG) ( tr, Ankara Üniversitesi Gözlemevi), is a Observatory#Ground-based observatories, ground-based astronomical observatory operated by the Astronomy and Space Sciences Department at Ankara University's Faculty of Science. Established in 1959 by Netherlands, Dutch astronomer Egbert Adriaan Kreiken in Ahlatlıbel, Ankara. Currently, it consists of nine optical telescopes and a radio telescope, which is currently taken out of service. Old instruments are displayed in a museum at the observatory. History Ankara University's Faculty of Science decided in 1954 to establish an observatory to begin with astronomical studies. Ahlatlıbel in Gölbaşı, Ankara was chosen as the ideal site, a location with dark skies far from the city's downtown to avoid the effects of light pollution, having an average 300 clear nights per year and also offering easy transportation from the campus. It is situated south of Ankara at an altitude of . Groundbreaking ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ankara University
Ankara University ( tr, Ankara Üniversitesi) is a public university in Ankara, the capital city of Turkey. It was the first higher education institution founded in Turkey after the formation of the republic in 1923. The university has 40 vocational programs, 120 undergraduate programs and 110 graduate programs. History Ankara University was founded by Mustafa Kemal Atatürk, the first president of Turkey. Ankara University faculties are: * Faculty of Political Science (1859). The faculty was founded as a community college in 1859 and has undergone series of changes since the establishment. It was named Mekteb-i Mulkiye-i Sahane under the Ministry of Internal Affairs but in 1918 the name was changed to Mekteb-i Mulkiye under the Ministry of Education. After the founding of the Republic, at the request of Atatürk, the school was moved to Ankara, and named the School of Political Science. On March 23, 1950, the school was placed under Ankara University as the "Facul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photometer
A photometer is an instrument that measures the strength of electromagnetic radiation in the range from ultraviolet to infrared and including the visible spectrum. Most photometers convert light into an electric current using a photoresistor, photodiode, or photomultiplier. Photometers measure: *Illuminance *Irradiance *Light absorption * Scattering of light *Reflection of light *Fluorescence *Phosphorescence *Luminescence History Before electronic light sensitive elements were developed, photometry was done by estimation by the eye. The relative luminous flux of a source was compared with a standard source. The photometer is placed such that the illuminance from the source being investigated is equal to the standard source, as the human eye can judge equal illuminance. The relative luminous fluxes can then be calculated as the illuminance decreases proportionally to the inverse square of distance. A standard example of such a photometer consists of a piece of paper with an o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hürriyet Daily News
The ''Hürriyet Daily News'', formerly ''Hürriyet Daily News and Economic Review'' and ''Turkish Daily News'', is the oldest current English-language daily in Turkey, founded in 1961. The paper was bought by the Doğan Media Group in 2001 and has been under the media group's flagship ''Hürriyet'' from 2006; both papers were sold to Demirören Holding in 2018. Ideology ''Hürriyet Daily News'' has generally taken a secular and liberal or centre-left position on most political issues, in contrast to Turkey's other main English-language daily, the '' Daily Sabah'', which is closely aligned with the Justice and Development Party of Recep Tayyip Erdoğan. Another conservative competitor, the Gülen movement-run '' Today's Zaman'', was shut down by the government following the 2016 Turkish coup d'état attempt. In May 2018, the new Erdoğan-aligned owners appointed a new editor and publisher and stated that they intended to run the paper as an independent, non-partisan voice, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sun Spot
Sunspots are phenomena on the Sun's photosphere that appear as temporary spots that are darker than the surrounding areas. They are regions of reduced surface temperature caused by concentrations of magnetic flux that inhibit convection. Sunspots appear within active regions, usually in pairs of opposite magnetic polarity. Their number varies according to the approximately 11-year solar cycle. Individual sunspots or groups of sunspots may last anywhere from a few days to a few months, but eventually decay. Sunspots expand and contract as they move across the surface of the Sun, with diameters ranging from to . Larger sunspots can be visible from Earth without the aid of a telescope. They may travel at relative speeds, or proper motions, of a few hundred meters per second when they first emerge. Indicating intense magnetic activity, sunspots accompany other active region phenomena such as coronal loops, prominences, and reconnection events. Most solar flares and coronal mas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T15 Coude Teleskop Binası 3
T15 or T-15 may refer to: Aerospace * T15 (satellite), a DirecTV communications satellite * Marlin Airport, Texas, United States * Slingsby T.15 Gull III, a British glider * Soyuz T-15, a crewed spaceflight Automobiles * Chery T15, a Chinese concept car * Simca-Gordini T15, a French racing car * Triumph T15 Terrier, a motorcycle Railway stations * Minami-Sunamachi Station, Tokyo, Japan * Nangō-Jūsan-Chōme Station, Sapporo, Hokkaido, Japan * Nijō Station (Kyoto), Japan * Sanuki-Tsuda Station, Kagawa, Japan * Sekime-Takadono Station, Osaka, Japan * Yagoto Station, Nagoya, Aichi, Japan Weapons and armour * Safir T-15, a rifle * Škoda T-15, a prototype German-Czechoslovakian light tank * T-15 torpedo, a Soviet nuclear torpedo * T-15 Armata, a Russian infantry fighting vehicle * Vickers T-15 light tank, of the Belgian Army Other uses * T-15 (reactor), a Russian fusion research reactor * Estonian national road 15 * T15 road (Tanzania) * * Little Swanport ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T15 Coude Teleskobu
T15 or T-15 may refer to: Aerospace * T15 (satellite), a DirecTV communications satellite * Marlin Airport, Texas, United States * Slingsby T.15 Gull III, a British glider * Soyuz T-15, a crewed spaceflight Automobiles * Chery T15, a Chinese concept car * Simca-Gordini T15, a French racing car * Triumph T15 Terrier, a motorcycle Railway stations * Minami-Sunamachi Station, Tokyo, Japan * Nangō-Jūsan-Chōme Station, Sapporo, Hokkaido, Japan * Nijō Station (Kyoto), Japan * Sanuki-Tsuda Station, Kagawa, Japan * Sekime-Takadono Station, Osaka, Japan * Yagoto Station, Nagoya, Aichi, Japan Weapons and armour * Safir T-15, a rifle * Škoda T-15, a prototype German-Czechoslovakian light tank * T-15 torpedo, a Soviet nuclear torpedo * T-15 Armata, a Russian infantry fighting vehicle * Vickers T-15 light tank, of the Belgian Army Other uses * T-15 (reactor), a Russian fusion research reactor * Estonian national road 15 * T15 road (Tanzania) * * Little Swanport ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maksutov Telescope
The Maksutov (also called a "Mak") is a catadioptric telescope design that combines a spherical mirror with a weakly negative meniscus lens in a design that takes advantage of all the surfaces being nearly "spherically symmetrical". The negative lens is usually full diameter and placed at the entrance pupil of the telescope (commonly called a "corrector plate" or "meniscus corrector shell"). The design corrects the problems of off-axis aberrations such as coma found in reflecting telescopes while also correcting chromatic aberration. It was patented in 1941 by Russian optician Dmitri Dmitrievich Maksutov. Maksutov based his design on the idea behind the Schmidt camera of using the spherical errors of a negative lens to correct the opposite errors in a spherical primary mirror. The design is most commonly seen in a Cassegrain variation, with an integrated secondary, that can use all-spherical elements, thereby simplifying fabrication. Maksutov telescopes have been sold on the ama ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
T35 Teleskop Binası 2
T35, T.35, T 35 or T-35 may refer to: * , a German warship of World War II * T-35 Buckaroo, a 1950 extremely low-cost trainer for commercial and export markets * T-35 Pillán, a 1991 Chilean propeller-driven basic trainer aircraft * T-35, a 1935 Soviet multi-turret heavy tank * Bugatti Type 35, a 1926 racing car * Slingsby T.35 Austral, a British glider * T35 (classification), a para-athletics classification for track athletes with cerebral palsy * T35, a 1940s prototype for the United States M10 tank destroyer * T35, a turboprop version of the Lockheed J37 jet engine * T 35, a modified two-seat training version of the 1945 de Havilland Vampire The de Havilland Vampire is a British jet fighter which was developed and manufactured by the de Havilland Aircraft Company. It was the second jet fighter to be operated by the RAF, after the Gloster Meteor, and the first to be powered by ... aircraft * T35, the station number of Nagahara Station, Osaka, Japan See also * T3.5, s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as either: * Intrinsic variables, whose luminosity actually changes; for example, because the star periodically swells and shrinks. * Extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth; for example, because the star has an orbiting companion that sometimes eclipses it. Many, possibly most, stars have at least some variation in luminosity: the energy output of the Sun, for example, varies by about 0.1% over an 11-year solar cycle. Discovery An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago may be the oldest preserved historical document of the discovery of a variable star, the eclipsing binary Algol. Of the modern astronomers, th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Binary Star
A binary star is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved using a telescope as separate stars, in which case they are called ''visual binaries''. Many visual binaries have long orbital periods of several centuries or millennia and therefore have orbits which are uncertain or poorly known. They may also be detected by indirect techniques, such as spectroscopy (''spectroscopic binaries'') or astrometry (''astrometric binaries''). If a binary star happens to orbit in a plane along our line of sight, its components will eclipse and transit each other; these pairs are called ''eclipsing binaries'', or, together with other binaries that change brightness as they orbit, ''photometric binaries''. If components in binary star systems are close enough they can gravitationally distort their mutual outer stellar atmospheres. In some cases, thes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photometry (astronomy)
Photometry, from Greek '' photo-'' ("light") and '' -metry'' ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. This light is measured through a telescope using a photometer, often made using electronic devices such as a CCD photometer or a photoelectric photometer that converts light into an electric current by the photoelectric effect. When calibrated against standard stars (or other light sources) of known intensity and colour, photometers can measure the brightness or apparent magnitude of celestial objects. The methods used to perform photometry depend on the wavelength region under study. At its most basic, photometry is conducted by gathering light and passing it through specialized photometric optical bandpass filters, and then capturing and recording the light energy with a photosensitive instrument. Standard sets of passbands (called a photometric system) are defined to allow a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photoelectric Effect
The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material. Electrons emitted in this manner are called photoelectrons. The phenomenon is studied in condensed matter physics, and solid state and quantum chemistry to draw inferences about the properties of atoms, molecules and solids. The effect has found use in electronic devices specialized for light detection and precisely timed electron emission. The experimental results disagree with classical electromagnetism, which predicts that continuous light waves transfer energy to electrons, which would then be emitted when they accumulate enough energy. An alteration in the intensity of light would theoretically change the kinetic energy of the emitted electrons, with sufficiently dim light resulting in a delayed emission. The experimental results instead show that electrons are dislodged only when the light exceeds a certain frequency—regardless of the light's intensity or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
_2007-04-30_T001456.gif "Click for more on -> Sun Spot")
