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Camera Obscura
A camera obscura (; ) is the natural phenomenon in which the rays of light passing through a aperture, small hole into a dark space form an image where they strike a surface, resulting in an inverted (upside down) and reversed (left to right) projector, projection of the view outside. ''Camera obscura'' can also refer to analogous constructions such as a darkened room, box or tent in which an exterior image is projected inside or onto a translucent screen viewed from outside. ''Camera obscuras'' with a lens in the opening have been used since the second half of the 16th century and became popular as aids for drawing and painting. The technology was developed further into the photographic camera in the first half of the 19th century, when ''camera obscura'' boxes were used to exposure (photography), expose photosensitivity, light-sensitive materials to the projected image. The image (or the principle of its projection) of a lensless ''camera obscura'' is also referred to as a " ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Projector
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display, or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen. The most common type of projector used today is called a video projector. Video projectors are digital replacements for earlier types of projectors such as slide projectors and overhead projectors. These earlier types of projectors were mostly replaced with digital video projectors throughout the 1990s and early 2000s, but old analog projectors are still used at some places. The newest types of projectors are handheld projectors that use lasers or LEDs to project images. Movie theaters used a type of projector called a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1755 James Ayscough
Events January–March * January 23 (O. S. January 12, Tatiana Day, nowadays celebrated on January 25) – Moscow University is established. * February 13 – Treaty of Giyanti: The kingdom of Mataram on Java is divided in two, creating the sultanate of Yogyakarta and the sunanate of Surakarta. * March 12 – A steam engine is used in the American colonies for the first time as New Jersey copper mine owner Arent Schuyler installs a Newcomen atmospheric engine to pump water out of a mineshaft. * March 22 – Britain's House of Commons votes in favor of £1,000,000 of appropriations to expand the British Army and Royal Navy operations in North America. * March 26 – General Edward Braddock and 1,600 British sailors and soldiers arrive at Alexandria, Virginia on transport ships that have sailed up the Potomac River. Braddock, sent to take command of the British forces against the French in North America, commandeers taverns and private homes to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diffraction
Diffraction is the deviation of waves from straight-line propagation without any change in their energy due to an obstacle or through an aperture. The diffracting object or aperture effectively becomes a secondary source of the Wave propagation, propagating wave. Diffraction is the same physical effect as Wave interference, interference, but interference is typically applied to superposition of a few waves and the term diffraction is used when many waves are superposed. Italian scientist Francesco Maria Grimaldi coined the word ''diffraction'' and was the first to record accurate observations of the phenomenon in 1660 in science, 1660. In classical physics, the diffraction phenomenon is described by the Huygens–Fresnel principle that treats each point in a propagating wavefront as a collection of individual spherical wavelets. The characteristic pattern is most pronounced when a wave from a Coherence (physics), coherent source (such as a laser) encounters a slit/aperture tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mozi
Mozi, personal name Mo Di, was a Chinese philosopher, logician, and founder of the Mohist school of thought, making him one of the most important figures of the Warring States period (221 BCE). Alongside Confucianism, Mohism became the most prominent, organized schools of the Hundred Schools of Thought throughout the period. The Mozi (book), ''Mozi'' is an anthology of writings traditionally attributed to Mozi and to his followers. Born in what is now Tengzhou, Shandong, Mozi and his followers argued strongly against both Confucianism and Taoism, with a philosophy emphasizing universal love, social order, the will of Tian, Heaven, sharing, and honoring the worthy. Mohism was actively developed and practiced across Warring States–era China, but fell out of favor following the establishment of the Qin dynasty in 221 BCE. While tradition assumes the destruction of many Mohist texts in 213 BCE as part of Emperor Qin Shi Huang's burning of books and burying of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mozi (book)
The ''Mozi'' ( zh, c=墨子), also called the ''Mojing'' ( zh, t=墨經) or the ''Mohist canon'', is an ancient Chinese text from the Warring States period (476–221 BC) that expounds the philosophy of Mohism. It propounds such Mohist ideals as impartiality, meritocratic governance, economic growth and aversion to ostentation, and is known for its plain and simple language. The book's chapters can be divided into several categories: a core of 31 chapters, containing the basics of Mohist philosophy; several traditionally known as the "Dialectical Chapters", among the most important in early Chinese texts on logic; five sections containing stories and information about Mozi, his disciples, and his followers; and eleven chapters on technology and defensive warfare, on which the Mohists were expert and which are valuable sources of information on ancient Chinese military technology. There two other minor sections: an initial group of seven chapters that are clearly of a much ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IMG 1650 Zonsverduistering Malta
img or IMG is an abbreviation for image. img or IMG may also refer to: Science, technology, and mathematics *IMG (file format), file that stores a complete and uncompressed copy of the contents of a storage device * IMG, a prefix for camera image file names commonly used in Design rule for Camera File system * mg/code>, a tag used in BBCode to place an image * , an HTML element used to place an image; see * Integrated Microbial Genomes System, a framework for comparative analysis of the genomes sequenced by the Joint Genome Institute * International medical graduate, a physician who has graduated from a medical school outside of the country in which he or she intends to practice * Iterated monodromy group, a concept in mathematics related to symbolic dynamics Companies * IMG (company), global sports and media business headquartered in New York City but with its main offices in Cleveland, originally known as the "International Management Group", with divisions including: ** I ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ibn Yunus
Abu al-Hasan 'Ali ibn Abi al-Said 'Abd al-Rahman ibn Ahmad ibn Yunus ibn Abd al-'Ala al-Sadafi al-Misri (Egyptian Arabic: ابن يونس; c. 950 – 1009) was an important Arabs, Arab Egyptians, Egyptian astronomer and Islamic mathematics, mathematician, whose works are noted for being ahead of their time, having been based on meticulous calculations and attention to detail. He is one of the famous Muslims, Muslim astronomers who appeared after Al-Battani and Abu al-Wafa' al-Buzjani, and he was perhaps the greatest astronomer of his time. Because of his brilliance, the Fatimid Caliphate, Fatimids gave him generous gifts and established an observatory for him on Mount Mokattam near Fustat. Al-Aziz Billah ordered him to make astronomical tables, which he completed during the reign of Al-Hakim bi-Amr Allah, son of Al-Aziz, and called it al-Zij al-Kabir al-Hakimi. The crater Ibn Yunus (crater), Ibn Yunus on the Moon is named after him. Life Information regarding his early life and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zhoubi Suanjing
The ''Zhoubi Suanjing'', also known by many other names, is an ancient Chinese astronomical and mathematical work. The ''Zhoubi'' is most famous for its presentation of Chinese cosmology and a form of the Pythagorean theorem. It claims to present 246 problems worked out by the Duke of Zhou as well as members of his court, placing its composition during the 11th century BC. However, the present form of the book does not seem to be earlier than the Eastern Han (25–220 AD), with some additions and commentaries continuing to be added for several more centuries. The book was included as part of the '' Ten Computational Canons''. Names The work's original title was simply the ''Zhoubi'': the character is a literary term for the femur or thighbone but in context only refers to one or more gnomons, large sticks whose shadows were used for Chinese calendrical and astronomical calculations. Because of the ambiguous nature of the character , it has been alternatel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gnomon
A gnomon (; ) is the part of a sundial that casts a shadow. The term is used for a variety of purposes in mathematics and other fields, typically to measure directions, position, or time. History A painted stick dating from 2300 BC that was excavated at the archeological site of Taosi is the oldest gnomon known in China. The gnomon was widely used in ancient China from the second millennium BC onward in order to determine the changes in seasons, orientation, and geographical latitude. The ancient Chinese used shadow measurements for creating calendars that are mentioned in several ancient texts. According to the collection of Zhou Chinese poetic anthologies ''Classic of Poetry'', one of the distant ancestors of King Wen of the Zhou dynasty used to measure gnomon shadow lengths to determine the orientation around the 14th century BC. The ancient Greek philosopher Anaximander (610–546 BC) is credited with introducing this Babylonian instrument to the Ancient Greeks. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Neolithic
The Neolithic or New Stone Age (from Ancient Greek, Greek 'new' and 'stone') is an archaeological period, the final division of the Stone Age in Mesopotamia, Asia, Europe and Africa (c. 10,000 BCE to c. 2,000 BCE). It saw the Neolithic Revolution, a wide-ranging set of developments that appear to have arisen independently in several parts of the world. This "Neolithic package" included the History of agriculture, introduction of farming, domestication of animals, and change from a hunter-gatherer lifestyle to one of sedentism, settlement. The term 'Neolithic' was coined by John Lubbock, 1st Baron Avebury, Sir John Lubbock in 1865 as a refinement of the three-age system. The Neolithic began about 12,000 years ago, when farming appeared in the Epipalaeolithic Near East and Mesopotamia, and later in other parts of the world. It lasted in the Near East until the transitional period of the Chalcolithic (Copper Age) from about 6,500 years ago (4500 BCE), marked by the development ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave Painting
In archaeology, cave paintings are a type of parietal art (which category also includes petroglyphs, or engravings), found on the wall or ceilings of caves. The term usually implies prehistoric art, prehistoric origin. These paintings were often created by ''Human, Homo sapiens'', but also Denisovan, Denisovans and Neanderthal, Neanderthals; other species in the same ''Homo'' genus. Discussion around prehistoric art is important in understanding the history of ''Homo sapiens'' and how human beings have come to have unique abstract thoughts. Some point to these prehistoric paintings as possible examples of creativity, spirituality, and sentimental thinking in prehistoric humans. The oldest known are more than 40,000 years old (art of the Upper Paleolithic) and found in the caves in the district of Maros (Sulawesi, Indonesia). The oldest are often constructed from hand stencils and simple geometric shapes.M. Aubert et al., "Pleistocene cave art from Sulawesi, Indonesia", ''Nature'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
