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Horrocks (crater)
Horrocks is a lunar impact crater located entirely within the eroded northeast rim of the much larger walled plain Hipparchus. Its diameter is 30 km. It was named after the 17th-century English astronomer Jeremiah Horrocks. To the south of Horrocks are the craters Halley and Hind, Rhaeticus is to the north, and Pickering to the northeast. Gyldén and Saunder lie to the west and east, respectively. The rim of Horrocks is somewhat irregular and polygonal, particularly with an outward protrusion on the eastern rim. It has a small outer rampart. The inner wall is slumped, particularly along the northwest where it forms a heap of talus. The interior floor is uneven, and it has a central mountain and hills. The crater is approximately 30 kilometers in diameter and 3 kilometers deep. It is from the Eratosthenian The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. It is named after the crater Eratosthenes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lunar Orbiter 4
Lunar Orbiter 4 was a robotic U.S. spacecraft, part of the Lunar Orbiter program, Lunar Orbiter Program, designed to orbit the Moon, after the three previous orbiters had completed the required needs for Project Apollo, Apollo mapping and site selection. It was given a more general objective, to "perform a broad systematic photographic survey of lunar surface features in order to increase the scientific knowledge of their nature, origin, and processes, and to serve as a basis for selecting sites for more detailed scientific study by subsequent orbital and landing missions". It was also equipped to collect selenodetic, radiation intensity, and micrometeoroid impact data. Mission Summary The spacecraft was placed in a Free-return trajectory, cislunar trajectory and injected into an elliptical near polar high lunar orbit for data acquisition. The orbit was with an inclination of 85.5 degrees and a period of 12 hours. After initial photography on May 11, 1967 problems started occu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhaeticus (crater)
Rhaeticus is a lunar impact crater that lies astride the equator of the Moon, on the southeast edge of the Sinus Medii. To the north-northwest is the crater Triesnecker, and due south can be found the worn remnant of the walled plain Hipparchus. The crater was named after Austrian astronomer Georg Joachim Rheticus.''Autostar Suite Astronomer Edition''. CD-ROM. Meade, April 2006. Description The outer wall of Rhaeticus is heavily disintegrated, with rifts and notches in the northeast. The wall is most intact along the eastern face, while in the northwest it is little more than a low rise in the surface. There is also a low cut in the south-southeast wall. The overall shape of the rim is that of a rough hexagon that is slightly elongated in the north–south direction. The interior has been resurfaced by lava, and only a few low rises remain in the surface. Beginning at the crest of the eastern wall is a chain of craterlets that continue to the east-northeast for about a crater dia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eratosthenian
The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. It is named after the crater Eratosthenes, which displays characteristics typical of craters of this age, including a surface that is not significantly eroded by subsequent impacts, but which also does not possess a ray system. The massive basaltic volcanism of the Imbrian period tapered off and ceased during this long span of lunar time. The youngest lunar lava flows identified from orbital images are tentatively placed near the end of this period. Its Earth equivalent consists of most of the Mesoarchean and Neoarchean eras (Archean eon), Paleoproterozoic and Mesoproterozoic eras ( Proterozoic eon). Examples Other than Eratosthenes itself, examples of large Eratosthenian craters on the near side of the moon include Langrenus, Macrobius, Aristoteles, Hausen, Moretus, Pythagoras, Scoresby, Bullialdus, Plutarch, and Cavalerius. On the far side, examples ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scree
Scree is a collection of broken rock fragments at the base of a cliff or other steep rocky mass that has accumulated through periodic rockfall. Landforms associated with these materials are often called talus deposits. Talus deposits typically have a concave upwards form, where the maximum inclination corresponds to the angle of repose of the mean debris particle size. The exact definition of scree in the primary literature is somewhat relaxed, and it often overlaps with both ''talus'' and ''colluvium''. The term ''scree'' comes from the Old Norse term for landslide, ''skriða'', while the term ''talus'' is a French word meaning a slope or embankment. In high-altitude arctic and subarctic regions, scree slopes and talus deposits are typically adjacent to hills and river valleys. These steep slopes usually originate from late-Pleistocene periglacial processes. Notable scree sites in Eastern North America include the Ice Caves at White Rocks National Recreation Area in southern Ve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rampart
Rampart may refer to: * Rampart (fortification), a defensive wall or bank around a castle, fort or settlement Rampart may also refer to: * "O'er the Ramparts We Watched" is a key line from "The Star-Spangled Banner", the national anthem of the United States of America * LAPD Rampart Division, a division of the Los Angeles Police Department ** Rampart scandal, a blanket term for the widespread corruption of the Rampart Division * ''Ramparts'' (magazine), a leftist American magazine that was published from 1962 through 1975 * Rampart Search and Rescue, Adams County, Colorado * RampART Social Center, an anti-authoritarian social centre in Whitechapel, East London UK * Apache Rampart module, a module from the Apache Software Foundation for Web Services security * Rampart High School, a National School of Excellence in Colorado Springs, Colorado * Ramparts (Lille Gate) Commonwealth War Graves Commission Cemetery in the Ypres Salient, Belgium * Rampart (G.I. Joe), a fictional charac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polygon
In geometry, a polygon () is a plane figure that is described by a finite number of straight line segments connected to form a closed ''polygonal chain'' (or ''polygonal circuit''). The bounded plane region, the bounding circuit, or the two together, may be called a polygon. The segments of a polygonal circuit are called its '' edges'' or ''sides''. The points where two edges meet are the polygon's '' vertices'' (singular: vertex) or ''corners''. The interior of a solid polygon is sometimes called its ''body''. An ''n''-gon is a polygon with ''n'' sides; for example, a triangle is a 3-gon. A simple polygon is one which does not intersect itself. Mathematicians are often concerned only with the bounding polygonal chains of simple polygons and they often define a polygon accordingly. A polygonal boundary may be allowed to cross over itself, creating star polygons and other self-intersecting polygons. A polygon is a 2-dimensional example of the more general polytope in any number ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Saunder (crater)
Saunder is a lunar impact crater located in the central highland region of the Moon, to the east-northeast of the walled plain Hipparchus. Its diameter is 44 km. It was named after British mathematician Samuel Arthur Saunder Samuel Arthur Saunder (1852 – December 8, 1912) was a British mathematician and selenographer who taught at Wellington College, Berkshire. In 1894 he became a fellow of the Royal Astronomical Society, and in 1908 he was made Gresham Professor o .... The outer wall is irregular and broken in several locations, forming the overall shape of a pentagon. The interior of Saunder has been flooded with lava, forming a level surface just below the rim. The floor lacks a central peak, but there are low rises in the southeast quadrant and a tiny craterlet towards the north rim. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Saunder. References * * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyldén (crater)
Gyldén is the remnant of a Lunar craters, lunar impact crater that is located to the northeast of the walled plain Ptolemaeus (lunar crater), Ptolemaeus on the Moon. Its diameter is 48 km. It is named after the Finland-Swedish astronomer Hugo Gyldén. It lies along the prime meridian of the selenographic coordinate system, and less than 150 km south of the lunar equator. Nearby craters of note include Herschel (lunar crater), Herschel to the west, the flooded Réaumur (crater), Réaumur to the north, and Hipparchus (lunar crater), Hipparchus to the east. The heart-shaped rim of this crater is in poor condition, having been eroded by impacts until the disintegrating remnants form an uneven ring of peaks and valleys around the interior floor. The satellite crater Réaumur A is attached to the northern rim. A wide cleft cuts through the western rim, continuing to the north-northwest past Spörer (crater), Spörer. The interior floor is relatively featureless, although the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pickering (lunar Crater)
Pickering is a small lunar impact crater located to the northeast of the worn walled plain Hipparchus in the central region of the Moon. It was named after American astronomers Edward Charles Pickering and William Henry Pickering. It lies more than 25 km northeast of the crater Horrocks, which lies within Hipparchus. To the southeast is the lava-flooded Saunder. Pickering is a bowl-shaped formation with a circular rim that has received little wear. It has a ray system that extends for about 160 kilometers. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Pickering. See also * Asteroid 784 Pickeringia 784 Pickeringia ('' prov. designation:'' ''or'' ) is a large background asteroid, approximately in diameter, located in the outer region of the asteroid belt. It was discovered on 20 March 1914, by American astronomer Joel Hastings Metcalf at ... References ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hind (crater)
Hind is a lunar impact crater that lies to the southeast of the walled plain Hipparchus, and due east of the crater Halley. Its diameter is 29 km. It was named after British astronomer John Russell Hind John Russell Hind FRS FRSE LLD (12 May 1823 – 23 December 1895) was an English astronomer. Life and work John Russell Hind was born in 1823 in Nottingham, the son of lace manufacturer John Hind and Elizabeth Russell, and was educated at .... The rim of Hind is relatively free of wear and distortion, except for a break at the north rim. The floor of Hind is relatively uneven, however, compared to the interior of Halley. Hind and the craters Hipparchus C and Hipparchus L form a line with diminishing diameters that point to the northeast. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Hind. References * * * * * * * * * * * External links Hind at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jeremiah Horrocks
Jeremiah Horrocks (16183 January 1641), sometimes given as Jeremiah Horrox (the Latinised version that he used on the Emmanuel College register and in his Latin manuscripts), – See footnote 1 was an English astronomer. He was the first person to demonstrate that the Moon moved around the Earth in an elliptical orbit; and he was the only person to predict the transit of Venus of 1639, an event which he and his friend William Crabtree were the only two people to observe and record. Most remarkably, Horrocks (correctly) asserted that Jupiter was accelerating in its orbit while Saturn was slowing and interpreted this as due to mutual gravitational interaction, thereby demonstrating that gravity's actions were not limited to the Earth, Sun, and Moon. His early death and the chaos of the English Civil War nearly resulted in the loss to science of his treatise on the transit, ''Venus in sole visa''; but for this and his other work he is acknowledged as one of the founding fathers o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halley (lunar Crater)
Halley is a lunar impact crater that is intruding into the southern wall of the walled plain Hipparchus. Its diameter is 35 km. The crater is named after the English astronomer Edmond Halley. On the 1645 map by Michael van Langren, the crater is called ''Gansii'', for the ''gansa'' (a kind of wild swan) of Francis Godwins ''The Man in the Moone''. To the southwest of Halley is the large crater Albategnius, and due east lies the slightly smaller Hind. The rim of Halley is somewhat worn, the east being scoured by debris from the Imbrium basin, hence forming part of the Imbrium Scultpure. The interior floor of Halley is relatively flat, being filled with material of the same albedo of the surrounding terrain, and is probably melt from the Imbrium impact. Satellite craters By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Halley. References Further reading * * * * * * * * * * * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
