|
Mishra Yantra
Mishra Yantra is an instrument in Jantar Mantar constructed between 1724 and 1730. A total of five Jantar mantars were constructed across North India in Jaipur, Delhi, Ujjain, Varanasi, and Mathura. They are one of the four astronomical instruments of the Jantar Mantar observatory located in New Delhi, India. Each instrument at Jantar Mantar are architecturally constructed based on mathematical observations, and help calculate celestial objects and time. The ''Mishra Yantra (mixed instrument)'', is a compilation of five different instruments). Historical and cultural importance The Mishra (composite) Yantra is composed of five instruments. This Yantra is one of the special instruments in Delhi observatory. It is believed to have been constructed by Maharaja Madho Singh (1751–68), the son of Maharaja Sawai Jai Singh II. The five yantras are the Dakshinottar Bhitti, Samrat Yantra (a smaller version of the large sundial, attached to Mishra Yantra, in two halves), Niyat Chakra, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jantar Mantar, New Delhi (Misra Yantra)
Jantar Mantar in New Delhi is an observatory, designed to be used with the naked eye. It is one of five Jantar Mantar in India. "Jantar Mantar" means "instruments for measuring the harmony of the heavens". It consists of 13 architectural astronomy instruments. The site is one of five built by Maharaja Jai Singh II of Jaipur, from 1723 onwards, revising the calendar and astronomical tables. Jai Singh, born in 1688 into a royal Rajput family that ruled the regional kingdom, was born into an era of education that maintained a keen interest in astronomy. There is a plaque fixed on one of the structures in the Jantar Mantar observatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710. Later research, though, suggests 1724 as the actual year of construction. Its height is . The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the Sun, Moon and planets. Some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sundial
A sundial is a horology, horological device that tells the time of day (referred to as civil time in modern usage) when direct sunlight shines by the position of the Sun, apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the ''dial'') and a gnomon, which casts a shadow onto the dial. As the Sun diurnal motion, appears to move through the sky, the shadow aligns with different hour-lines, which are marked on the dial to indicate the time of day. The ''style'' is the time-telling edge of the gnomon, though a single point or ''nodus'' may be used. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, wire, or elaborately decorated metal casting. The style must be polar alignment, parallel to the axis of the Earth's rotation for the sundial to be accurate throughout the year. The style's angle from horizontal is equal to the sundial's geographical latitude. The term ''sundial'' can r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hindu
Hindus (; ; also known as Sanātanīs) are people who religiously adhere to Hinduism, also known by its endonym Sanātana Dharma. Jeffery D. Long (2007), A Vision for Hinduism, IB Tauris, , pp. 35–37 Historically, the term has also been used as a geographical, cultural, and later religious identifier for people living in the Indian subcontinent. It is assumed that the term ''"Hindu"'' traces back to Avestan scripture Vendidad which refers to land of seven rivers as Hapta Hendu which itself is a cognate to Sanskrit term ''Sapta Sindhuḥ''. (The term ''Sapta Sindhuḥ'' is mentioned in Rig Veda and refers to a North western Indian region of seven rivers and to India as a whole.) The Greek cognates of the same terms are "''Indus''" (for the river) and "''India''" (for the land of the river). Likewise the Hebrew cognate ''hōd-dū'' refers to India mentioned in Hebrew BibleEsther 1:1. The term "''Hindu''" also implied a geographic, ethnic or cultural identifier for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arab (etymology)
The proper name ''Arab'' or ''Arabian'' (and cognates in other languages) has been used to translate several different but similar-sounding words in ancient and classical texts which do not necessarily have the same meaning or origin. The etymology of the term is closely linked to that of the place name ''Arabia''. Semitic etymology The root of the word has many meanings in Semitic languages including ''desert'', ''nomad'', ''merchant'', and ''comprehensible'' with all of these having varying degrees of relevance to the emergence of the name. It is also possible that some forms were metathetical from root "moving around", and hence, it is alleged, "nomadic". The plurality of meanings results partly from the assimilation of the proto-Semitic '' ghayin'' with in some languages. In Hebrew the word ' thus has the same triconsonantal root as the root meaning "west" ( ') "setting sun" or "evening" ( ', '). The direct Arabic cognate of this is ' ("west", etc.) rather than ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Greeks
Greeks or Hellenes (; , ) are an ethnic group and nation native to Greece, Greek Cypriots, Cyprus, Greeks in Albania, southern Albania, Greeks in Turkey#History, Anatolia, parts of Greeks in Italy, Italy and Egyptian Greeks, Egypt, and to a lesser extent, other countries surrounding the Eastern Mediterranean and Black Sea. They also form a significant Greek diaspora, diaspora (), with many Greek communities established around the world.. Greek colonies and communities have been historically established on the shores of the Mediterranean Sea and Black Sea, but the Greek people themselves have always been centered on the Aegean Sea, Aegean and Ionian Sea, Ionian seas, where the Greek language has been spoken since the Bronze Age.. Until the early 20th century, Greeks were distributed between the Greek peninsula, the western coast of Asia Minor, the Black Sea coast, Cappadocia in central Anatolia, Egypt, the Balkans, Cyprus, and Constantinople. Many of these regions coincided to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sawai Jai Singh
Sawai Jai Singh II (3 November 1688 – 21 September 1743), was the 30th Kachwaha Rajput ruler of the Kingdom of Amber, who later founded the fortified city of Jaipur and made it his capital. He became the ruler of Amber at the age of 11, after the untimely death of his father Mirza Raja Bishan Singh on 31 December 1699. Initially, Raja Jai Singh served as a vassal of the Mughal Empire. He was given the title of "''Sawai"'' by Mughal Emperor Aurangzeb before the siege of Khelna Fort in Deccan."Sawai" means one and a quarter times superior to his contemporaries. He received the title of "''Maharaja Sawai'', ''Raj Rajeshwar'', ''Shri Rajadhiraj'' " in the year 1723 which happened to be the reign of later Mughals under emperor Muhammad Shah; this was in addition to the title of "''Saramad-i-Raja-i-Hindustan"'', conferred on him on 21 April 1721.Sarkar, Jadunath (1994) A History of Jaipur, New Delhi: Orient Blackswan, , pp. 171, 173 In the later part of his life Sawai Jai Singh bro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Longitude
Longitude (, ) is a geographic coordinate that specifies the east- west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians are imaginary semicircular lines running from pole to pole that connect points with the same longitude. The prime meridian defines 0° longitude; by convention the International Reference Meridian for the Earth passes near the Royal Observatory in Greenwich, south-east London on the island of Great Britain. Positive longitudes are east of the prime meridian, and negative ones are west. Because of the Earth's rotation, there is a close connection between longitude and time measurement. Scientifically precise local time varies with longitude: a difference of 15° longitude corresponds to a one-hour difference in local time, due to the differing position in relation to the Sun. Comparing local time to an absol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Latitude
In geography, latitude is a geographic coordinate system, geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at the south pole to 90° at the north pole, with 0° at the Equator. Parallel (latitude), Lines of constant latitude, or ''parallels'', run east-west as circles parallel to the equator. Latitude and longitude are used together as a coordinate pair to specify a location on the surface of the Earth. On its own, the term "latitude" normally refers to the ''geodetic latitude'' as defined below. Briefly, the geodetic latitude of a point is the angle formed between the vector perpendicular (or ''Normal (geometry), normal'') to the ellipsoidal surface from the point, and the equatorial plane, plane of the equator. Background Two levels of abstraction are employed in the definitions of latitude and longitude. In the first step the physical surface i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylindrical
A cylinder () has traditionally been a Solid geometry, three-dimensional solid, one of the most basic of curvilinear geometric shapes. In elementary geometry, it is considered a Prism (geometry), prism with a circle as its base. A cylinder may also be defined as an infinite set, infinite curvilinear surface (mathematics), surface in various modern branches of geometry and topology. The shift in the basic meaning—solid versus surface (as in a solid ball (mathematics), ball versus sphere surface)—has created some ambiguity with terminology. The two concepts may be distinguished by referring to solid cylinders and cylindrical surfaces. In the literature the unadorned term "cylinder" could refer to either of these or to an even more specialized object, the ''right circular cylinder''. Types The definitions and results in this section are taken from the 1913 text ''Plane and Solid Geometry'' by George A. Wentworth and David Eugene Smith . A ' is a Surface (mathematics), surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemispherical
A sphere (from Ancient Greek, Greek , ) is a surface (mathematics), surface analogous to the circle, a curve. In solid geometry, a sphere is the Locus (mathematics), set of points that are all at the same distance from a given point in three-dimensional space.. That given point is the center (geometry), ''center'' of the sphere, and the distance is the sphere's ''radius''. The earliest known mentions of spheres appear in the work of the Greek mathematics, ancient Greek mathematicians. The sphere is a fundamental surface in many fields of mathematics. Spheres and nearly-spherical shapes also appear in nature and industry. Bubble (physics), Bubbles such as soap bubbles take a spherical shape in equilibrium. The Earth is spherical Earth, often approximated as a sphere in geography, and the celestial sphere is an important concept in astronomy. Manufactured items including pressure vessels and most curved mirrors and lenses are based on spheres. Spheres rolling, roll smoothly in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lens (optics)
A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (''elements''), usually arranged along a common axis. Lenses are made from materials such as glass or plastic and are ground, polished, or molded to the required shape. A lens can focus light to form an image, unlike a prism, which refracts light without focusing. Devices that similarly focus or disperse waves and radiation other than visible light are also called "lenses", such as microwave lenses, electron lenses, acoustic lenses, or explosive lenses. Lenses are used in various imaging devices such as telescopes, binoculars, and cameras. They are also used as visual aids in glasses to correct defects of vision such as myopia and hypermetropia. History The word ''lens'' comes from , the Latin name of the lentil (a seed of a lentil pla ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Delhi, India
New Delhi (; ) is the Capital city, capital of India and a part of the Delhi, National Capital Territory of Delhi (NCT). New Delhi is the seat of all three branches of the Government of India, hosting the Rashtrapati Bhavan, New Parliament House, New Delhi, Sansad Bhavan, and the Supreme Court of India, Supreme Court. New Delhi is a Municipal governance in India, municipality within the NCT, administered by the New Delhi Municipal Council (NDMC), which covers mostly Lutyens' Delhi and a few adjacent areas. The municipal area is part of a larger List of districts in India, administrative district, the New Delhi district. Although colloquially ''Delhi'' and ''New Delhi'' are used interchangeably to refer to the National Capital Territory of Delhi, both are distinct entities, with the municipality and the New Delhi district forming a relatively small part within the megacity of Delhi. The National Capital Region (India), National Capital Region is an even larger entity, compris ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
