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Washington Meridian
The Washington meridians are four meridians that were used as prime meridians in the United States and pass through Washington, D.C. The four which have been specified are: # through the Capitol # through the White House # through the old Naval Observatory # through the new Naval Observatory. Their longitudes may be reported in three ways: # relative to the local vertical used by astronomic observations # relative to NAD 27 ( North American Datum 1927), an ellipsoid of revolution that is at mean sea level beneath triangulation station Meades Ranch, Kansas (not Earth-centered); # relative to NAD 83, an Earth-centered ellipsoid of revolution with dimensions chosen to best fit the undulating (±100 m) geoid (world-wide mean sea level). NAD83 longitude of the Capitol is about 1.1 arc seconds less than its NAD27 longitude; astronomic longitude there is about 4 arc seconds less than NAD83. Capitol meridian Pierre (Peter) Charles L'Enfant specified the first meridian in his 1791 "' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Principal Meridian
A principal meridian is a meridian used for survey control in a large region. Canada The Dominion Land Survey of Western Canada took its origin at the First (or Principal) Meridian, located at 97°27′28.41″ west of Greenwich, just west of Winnipeg, Manitoba. This line is exactly ten miles west of the Red River at the Canada–United States border. Six other meridians were designated at four-degree intervals westward, with the seventh located in British Columbia; the second and fourth meridians form the general eastern border and the western border of Saskatchewan. United States In the United States Public Land Survey System, a principal meridian is the principal north-south line used for survey control in a large region, and which divides townships between east and west. The meridian meets its corresponding baseline at the point of origin, or initial point, for the land survey. For example, the Mount Diablo Meridian, used for surveys in California and Nevada, runs north-s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jean Jules Jusserand
Jean Adrien Antoine Jules Jusserand (18 February 1855 – 18 July 1932) was a French author and diplomat. He was the French Ambassador to the United States 1903-1925 and played a major diplomatic role during World War I. Birth and education Born into a rich Lyonnais family, Jean Jules Jusserand spent his childhood between his familial residence in Saint-Haon-le-Châtel and Chalon's boarding school in Lyon. After his father's death in 1870, he was determined to honour him by learning new cultures and excelling in his international and bicultural career. After his scholarship in Chartreux, he continued his studies at the Université de Lyon, not knowing where these studies would lead him. He also wanted to increase his knowledge, which he judged insufficient. He studied literature, science, law and history, where he became an excellent student in all the subjects. He received two licenses, history and law, and, despite the worries his family had about him not completing his s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Pier
Jefferson Pier, Jefferson Stone, or the Jefferson Pier Stone, (pronounced pie-er, like radials of a pie) in Washington, D.C., marks the second prime meridian of the United States even though it was never officially recognized, either by presidential proclamation or by a resolution or act of Congress. Location and inscription The stone is on the National Mall almost due south of the center of the White House and the midline of 16th Street, NW, about due west of the center of the United States Capitol building, almost due north of the center of the Jefferson Memorial and WNW of the center of the Washington Monument.Coordinates for: * Center of the White House: * Center of United States Capitol: * Center of Jefferson Pier: * Center of Jefferson Memorial: The monument is a , tall granitic monolith with crossing longitudinal and latitudinal lines engraved on its upper surface and with a defaced inscription engraved on its west face that states: POSITION OF JEFFERSON PIER ER ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Memorial
The Jefferson Memorial is a presidential memorial built in Washington, D.C. between 1939 and 1943 in honor of Thomas Jefferson, the principal author of the United States Declaration of Independence, a central intellectual force behind the American Revolution, founder of the Democratic-Republican Party, and the nation's third president. The Jefferson Memorial features multiple Jefferson quotes designed to capture Jefferson's ideology and philosophy, known as Jeffersonian democracy, which was staunchly supportive of American republicanism, individual rights, religious freedom, states' rights, and virtue and prioritized and valued what he saw as the undervalued independent yeoman. Jefferson was simultaneously deeply skeptical of cities and financiers and hostile to aristocracy, elitism, and corruption. He is widely considered among the most influential political minds of his age and one of the most consequential intellectual forces behind the American Revolution. The Jeffer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Washington
George Washington (February 22, 1732, 1799) was an American military officer, statesman, and Founding Father who served as the first president of the United States from 1789 to 1797. Appointed by the Continental Congress as commander of the Continental Army, Washington led the Patriot forces to victory in the American Revolutionary War and served as the president of the Constitutional Convention of 1787, which created the Constitution of the United States and the American federal government. Washington has been called the " Father of his Country" for his manifold leadership in the formative days of the country. Washington's first public office was serving as the official surveyor of Culpeper County, Virginia, from 1749 to 1750. Subsequently, he received his first military training (as well as a command with the Virginia Regiment) during the French and Indian War. He was later elected to the Virginia House of Burgesses and was named a delegate to the Continental Congress ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Right Triangle
A right triangle (American English) or right-angled triangle (British), or more formally an orthogonal triangle, formerly called a rectangled triangle ( grc, ὀρθόσγωνία, lit=upright angle), is a triangle in which one angle is a right angle (that is, a 90-degree angle), i.e., in which two sides are perpendicular. The relation between the sides and other angles of the right triangle is the basis for trigonometry. The side opposite to the right angle is called the ''hypotenuse'' (side ''c'' in the figure). The sides adjacent to the right angle are called ''legs'' (or ''catheti'', singular: ''cathetus''). Side ''a'' may be identified as the side ''adjacent to angle B'' and ''opposed to'' (or ''opposite'') ''angle A'', while side ''b'' is the side ''adjacent to angle A'' and ''opposed to angle B''. If the lengths of all three sides of a right triangle are integers, the triangle is said to be a Pythagorean triangle and its side lengths are collectively known as a ''Pythagor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Pier And Washington Monument
Jefferson may refer to: Names * Jefferson (surname) * Jefferson (given name) People * Jefferson (president), Thomas Jefferson (1743–1826), third president of the United States * Jefferson (footballer, born 1970), full name Jefferson Tomaz de Souza, Brazilian football midfielder * Jefferson (footballer, born 1978), full name Jefferson Fredo Rodrigues, Brazilian football midfielder * Jefferson (footballer, born 1981), full name Jefferson Vieira da Cruz, Brazilian football striker * Jefferson (footballer, born 1982), full name Jefferson Charles de Souza Pinto, Brazilian football midfielder * Jefferson (footballer, born 1983), full name Jefferson de Oliveira Galvão, Brazilian football goalkeeper * Jefferson (footballer, born January 1988), full name Jefferson Andrade Siqueira, Brazilian football striker * Jefferson (footballer, born July 1988), full name Jefferson Moreira Nascimento, Brazilian football left-back * Jefferson (footballer, born August 1988), full name Jefferson Lope ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Geodetic Survey
The National Geodetic Survey (NGS) is a List of federal agencies in the United States, United States federal agency that defines and manages a national coordinate system, providing the foundation for transportation and communication; mapping and charting; and a large number of applications of science and engineering. Since its foundation in its present form in 1970, it has been part of the National Oceanic and Atmospheric Administration (NOAA), of the United States Department of Commerce. History The National Geodetic Surveys history and heritage are intertwined with those of other NOAA offices. It traces its history to the Survey of the Coast, which was formed in 1807 as the first scientific agency of the United States Government. It became the United States Coast Survey in 1836 and the United States Coast and Geodetic Survey in 1878, the latter name change reflecting the increasing role of geodesy in its work. Upon the creation of NOAA in 1970, the Coast and Geodetic Survey w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Civil War
The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by states that had seceded. The central cause of the war was the dispute over whether slavery would be permitted to expand into the western territories, leading to more slave states, or be prevented from doing so, which was widely believed would place slavery on a course of ultimate extinction. Decades of political controversy over slavery were brought to a head by the victory in the 1860 U.S. presidential election of Abraham Lincoln, who opposed slavery's expansion into the west. An initial seven southern slave states responded to Lincoln's victory by seceding from the United States and, in 1861, forming the Confederacy. The Confederacy seized U.S. forts and other federal assets within their borders. Led by Confederate President Jefferson Davis, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angle
In Euclidean geometry, an angle is the figure formed by two Ray (geometry), rays, called the ''Side (plane geometry), sides'' of the angle, sharing a common endpoint, called the ''vertex (geometry), vertex'' of the angle. Angles formed by two rays lie in the plane (geometry), plane that contains the rays. Angles are also formed by the intersection of two planes. These are called dihedral angles. Two intersecting curves may also define an angle, which is the angle of the rays lying tangent to the respective curves at their point of intersection. ''Angle'' is also used to designate the measurement, measure of an angle or of a Rotation (mathematics), rotation. This measure is the ratio of the length of a arc (geometry), circular arc to its radius. In the case of a geometric angle, the arc is centered at the vertex and delimited by the sides. In the case of a rotation, the arc is centered at the center of the rotation and delimited by any other point and its image by the rotation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transit Instrument
In astronomy, a transit instrument is a small telescope with extremely precisely graduated mount used for the precise observation of star positions. They were previously widely used in astronomical observatories and naval observatories to measure star positions in order to compile nautical almanacs for use by mariners for celestial navigation, and observe star transits to set extremely accurate clocks ( astronomical regulators) which were used to set marine chronometers carried on ships to determine longitude, and as primary time standards before atomic clocks. The instruments can be divided into three groups: meridian, zenith, and universal instruments. Types Meridian instruments For observation of star transits in the exact direction of South or North: * Meridian circles, Mural quadrants etc. * Passage instruments (transportable, also for prime vertical transits) Zenith instruments * Zenith telescope * Photozenith tube (PZT) * zenith cameras * Danjon astrolabe, Zei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
