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3.6m Devasthal Optical Telescope
The 3.6m Devasthal (Hindi: देवस्थल) Optical Telescope is a clear-aperture Ritchey–Chrétien telescope built by Aryabhatta Research Institute of Observational Sciences (ARIES) and is located at the Devasthal Observatory site near Nainital, Kumaon, India. ARIES operates another 1.3m telescope at the same location. The telescope was activated remotely on 31 March 2016 by Indian Prime Minister Narendra Modi and Belgian Prime Minister Charles Michel from Brussels. The telescope optics were built in collaboration with the Belgian firm Advanced Mechanical and Optical System (AMOS). The 3.6m DOT is currently the largest reflecting telescope in Asia. The telescope intends to fill a large longitudinal gap in the 4m class of telescopes in the Asia region. The telescope features an optical spectrograph, a CCD imager and a near-infrared spectrograph. The telescope is also the first of its kind in India that features an active optics system, featuring a wavefront sensor and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ritchey–Chrétien Telescope
A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma). The RCT has a wider field of view free of optical errors compared to a more traditional reflecting telescope configuration. Since the mid 20th century, a majority of large professional research telescopes have been Ritchey–Chrétien configurations; some well-known examples are the Hubble Space Telescope, the Keck telescopes and the ESO Very Large Telescope. History The Ritchey–Chrétien telescope was invented in the early 1910s by American astronomer George Willis Ritchey and French astronomer Henri Chrétien. Ritchey constructed the first successful RCT, which had an aperture diameter of in 1927 (e.g. Ritchey 24-inch reflector). The second RCT was a instrument constructed by Ritchey for the United States Naval Observatory; that telescope is st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aryabhatta Research Institute Of Observational Sciences
Aryabhatta Research Institute of Observational Sciences (ARIES) is a research institute in Nainital, Kumaon, India which specializes in astronomy, solar physics, astrophysics and atmospheric science. It is an autonomous body under the Department of Science and Technology, Government of India. The institute is situated at Manora Peak (elevation ), about from Nainital, headquarters of Kumaon division. The astronomical observatory is open to the public on afternoons, and on occasional moonlit nights with prior permission. History The institute was started on 20 April 1954 under the supervision of Dr. A. N. Singh as Uttar Pradesh State Observatory (UPSO) in the premises of the Government Sanskrit College, presently known as Sampurnanand Sanskrit Vishwavidyalaya, Varanasi, Uttar Pradesh. With the formation of the State of Uttarakhand on 9 November 2000, and because of its geographical location within the boundaries of Uttarakhand, UPSO came under the administrative control o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devasthal Observatory
Devasthal is an observatory in the district of Nainital, Kumaon, India. The literal meaning of the place is "abode of god". The observatory is situated in the Kumaon Himalayas at an altitude of 2450 meters. Devasthal peak is an emerging optical astronomical site for Indian telescopes. Currently, a 130-cm optical telescope is working at the site. The sites are managed by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital. The site has already received a 360-cm telescope and a 400-cm liquid mirror telescope which is under construction & likely to be completed by the year 2022. A survey for installing solar telescope is also being carried out near the peak. The place is well equipped with guest house, canteen, internet connection, water and electric supply since 2008. Devasthal is located 9 km from Dhanachuli, the nearest town in Nainital district. See also * List of astronomical observatories This is a list of astronomical observatories ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nainital
Nainital ( Kumaoni: ''Naintāl''; ) is a city and headquarters of Nainital district of Kumaon division, Uttarakhand, India. It is the judicial capital of Uttarakhand, the High Court of the state being located there and is the headquarters of an eponymous district. It also houses the Governor of Uttarakhand, who resides in the Raj Bhavan. Nainital was the summer capital of the United Provinces. Nainital is located in the Kumaon foothills of the Jagbeer Himalayas at a distance of from the state capital Dehradun and from New Delhi, the capital of India. Situated at an altitude of above sea level, the city is set in a valley containing an eye-shaped lake, approximately two miles in circumference, and surrounded by mountains, of which the highest are Naina Peak () on the north, Deopatha () on the west, and Ayarpatha () on the south. From the tops of the higher peaks, "magnificent views can be obtained of the vast plain to the south, or of the mass of tangled ridges lying no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kumaon Division
Kumaon (; Kumaoni: ''Kumāū''; ; historically romanized as KemāonJames Prinsep (Editor)John McClelland ) is a revenue and administrative division in the Indian State of Uttarakhand. It spans over the eastern half of the state and is bounded on the north by Tibet, on the east by Nepal, on the south by the state of Uttar Pradesh, and on the west by Garhwal. Kumaon comprises six districts of the state: Almora, Bageshwar, Champawat, Nainital, Pithoragarh and Udham Singh Nagar. Historically known as Manaskhand and then Kurmanchal, the Kumaon region has been ruled by several Hindu dynasties over the course of history; most notably the Katyuris and the Chands. The Kumaon division was established in 1816, when the British reclaimed this region from the Gorkhas, who had annexed the erstwhile Kingdom of Kumaon in 1790. It was formed into a division of what was then called Ceded and Conquered Provinces, later known as United Provinces. In independent India the state was called Utt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Narendra Modi
Narendra Damodardas Modi (; born 17 September 1950) is an Indian politician serving as the 14th and current Prime Minister of India since 2014. Modi was the Chief Minister of Gujarat from 2001 to 2014 and is the Member of Parliament from Varanasi. He is a member of the Bharatiya Janata Party (BJP) and of the Rashtriya Swayamsevak Sangh (RSS), a right-wing Hindu nationalist paramilitary volunteer organisation. He is the longest serving prime minister from outside the Indian National Congress. Modi was born and raised in Vadnagar in northeastern Gujarat, where he completed his secondary education. He was introduced to the RSS at age eight. He has reminisced about helping out after school at his father's tea stall at the Vadnagar railway station. At age 18, Modi was married to Jashodaben Chimanlal Modi, whom he abandoned soon after. He first publicly acknowledged her as his wife more than four decades later when required to do so by Indian law, but has made no contact with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Michel
Charles Michel (; born 21 December 1975) is a Belgian politician serving as the president of the European Council since 2019. He previously served as the prime minister of Belgium between 2014 and 2019. Michel became the minister of Development Cooperation in 2007, and remained in this position until elected the leader of the Francophone liberal Reformist Movement (MR) in February 2011. He led MR to the 2014 federal election, where they emerged as the third-largest party in the Chamber of Representatives. After coalition negotiations, Michel was confirmed as Prime Minister of a MR- N-VA- OVLD- CD&V government. He was sworn in on 11 October 2014, becoming the youngest Belgian Prime Minister since 1845. In December 2018, the government collapsed following internal disagreements over the handling of the Global Compact for Migration, with the N-VA withdrawing from the cabinet. Michel subsequently tendered his resignation and remained in office in a caretaker capacity. At the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Spectrometer
An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify materials. The variable measured is most often the light's Intensity (physics), intensity but could also, for instance, be the Polarization (waves), polarization state. The independent variable is usually the wavelength of the light or a unit directly proportional to the photon energy, such as Wavenumber, reciprocal centimeters or electron volts, which has a reciprocal relationship to wavelength. A spectrometer is used in spectroscopy for producing spectral lines and measuring their wavelengths and intensities. Spectrometers may operate over a wide range of non-optical wavelengths, from gamma rays and X-rays into the far infrared. If the instrument is designed to measure the spectrum on an absolute scale rather than a relative one, then it is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adaptive Optics
Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effect of incoming wavefront distortions by deforming a mirror in order to compensate for the distortion. It is used in astronomical telescopes and laser communication systems to remove the effects of atmospheric distortion, in microscopy, optical fabrication and in retinal imaging systems to reduce optical aberrations. Adaptive optics works by measuring the distortions in a wavefront and compensating for them with a device that corrects those errors such as a deformable mirror or a liquid crystal array. Adaptive optics should not be confused with active optics, which works on a longer timescale to correct the primary mirror geometry. Other methods can achieve resolving power exceeding the limit imposed by atmospheric distortion, such as speckle imaging, aperture synthesis, and lucky imaging, or by moving outside the atmosphere with space telescopes, such as the Hubble Sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Largest Optical Reflecting Telescopes
A ''list'' is any set of items in a row. List or lists may also refer to: People * List (surname) Organizations * List College, an undergraduate division of the Jewish Theological Seminary of America * SC Germania List, German rugby union club Other uses * Angle of list, the leaning to either port or starboard of a ship * List (information), an ordered collection of pieces of information ** List (abstract data type), a method to organize data in computer science * List on Sylt, previously called List, the northernmost village in Germany, on the island of Sylt * ''List'', an alternative term for ''roll'' in flight dynamics * To ''list'' a building, etc., in the UK it means to designate it a listed building that may not be altered without permission * Lists (jousting), the barriers used to designate the tournament area where medieval knights jousted * ''The Book of Lists'', an American series of books with unusual lists See also * The List (other) * Listing (di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lists Of Telescopes
This is a list of lists of telescopes. *List of astronomical interferometers at visible and infrared wavelengths *List of astronomical observatories *List of highest astronomical observatories *List of large optical telescopes *List of largest infrared telescopes *List of largest optical telescopes historically *List of largest optical telescopes in the 18th century *List of largest optical telescopes in the 19th century *List of largest optical telescopes in the 20th century *List of largest optical reflecting telescopes *List of largest optical refracting telescopes *List of optical telescopes *List of proposed space observatories *List of radio telescopes *List of solar telescopes *List of space telescopes *List of telescopes of Australia *List of largest optical telescopes in the British Isles *List of telescope parts and construction *List of telescope types *List of the largest optical telescopes in North America *List of X-ray space telescopes See also * Lists of astronaut ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optical Telescopes
An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors. There are three primary types of optical telescope: * Refracting telescopes, which use lenses and less commonly also prisms (dioptrics) * Reflecting telescopes, which use mirrors ( catoptrics) * Catadioptric telescopes, which combine lenses and mirrors An optical telescope's ability to resolve small details is directly related to the diameter (or aperture) of its objective (the primary lens or mirror that collects and focuses the light), and its light-gathering power is related to the area of the objective. The larger the objective, the more light the telescope collects and the finer detail it resolves. People use optical telescopes (including monoculars and binoculars) for outdoor activities such as observation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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