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Washington Meridian
The Washington meridians are four meridians that were used as prime meridians in the United States which pass through Washington, D.C. The four that 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 ... [...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 University of 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 st ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Pier
Jefferson Pier, Jefferson Stone, or the Jefferson Pier Stone, () is a stone in Washington, D.C. that 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. It is located WNW of the center of the Washington Monument. 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Memorial
The Jefferson Memorial is a national memorial in Washington, D.C., built in honor of Thomas Jefferson, the principal author of the United States Declaration of Independence, a central intellectual force behind the American Revolution, a founder of the Democratic-Republican Party, and the nation's third president. Built between 1939 and 1943, the memorial features multiple quotes from Jefferson intended to capture his ideology and philosophy, known as Jeffersonian democracy, which was staunchly supportive of American republicanism, individual rights, religious freedom, states' rights, 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 era and one of the most consequential intellectual forces behind both the American Revolution and the American E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Washington
George Washington (, 1799) was a Founding Fathers of the United States, Founding Father and the first president of the United States, serving from 1789 to 1797. As commander of the Continental Army, Washington led Patriot (American Revolution), Patriot forces to victory in the American Revolutionary War against the British Empire. He is commonly known as the Father of the Nation for his role in bringing about American independence. Born in the Colony of Virginia, Washington became the commander of the Virginia Regiment during the French and Indian War (1754–1763). He was later elected to the Virginia House of Burgesses, and opposed the perceived oppression of the American colonists by the British Crown. When the American Revolutionary War against the British began in 1775, Washington was appointed Commanding General of the United States Army, commander-in-chief of the Continental Army. He directed a poorly organized and equipped force against disciplined British troops. Wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Right Triangle
A right triangle or right-angled triangle, sometimes called an orthogonal triangle or rectangular triangle, is a triangle in which two sides are perpendicular, forming a right angle ( turn or 90 degrees). 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 ''opposite'' (or ''opposed to'') angle A, while side b is the side adjacent to angle A and opposite angle B. Every right triangle is half of a rectangle which has been divided along its diagonal. When the rectangle is a square, its right-triangular half is isosceles, with two congruent sides and two congruent angles. When the rectangle is not a square, its right-triangular half is scalene. Every triangle whose base is the diameter of a circle and whose apex lies on the circle is a right triangle, with the right angle at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jefferson Pier And Washington Monument
Jefferson may refer to: Names * Jefferson (surname) * Jefferson (given name) People * Thomas Jefferson (1743–1826), third president of the United States * Jefferson (footballer) * Jefferson (singer) or Geoff Turton (born 1944), British singer Places Canada *Jefferson, Alberta United States *Jefferson, Alabama *Jefferson, Columbia County, Arkansas *Jefferson, Jefferson County, Arkansas * Jefferson, Colorado *Jefferson, Camden County, Georgia *Jefferson, Georgia, the county seat of Jackson County *Jefferson, Indiana *Jefferson, Iowa * Jefferson, Kansas *Jeffersontown, Kentucky, originally known as Jefferson *Jefferson, Louisiana *Jefferson, Maine *Jefferson, Maryland *Jefferson, Massachusetts, a village in the town of Holden *Jefferson, Minnesota *Jefferson, New Hampshire *Jefferson, New York, a town **Jefferson (CDP), New York, main hamlet in the town *Jefferson, North Carolina *Jefferson, Ohio *Jefferson, Oklahoma *Jefferson, Oregon *Jefferson, Greene County, Pennsy ... [...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 based in Washington, D.C. that defines and manages a national geographic coordinate system, coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications. Since its founding in 1970, it has been part of the National Oceanic and Atmospheric Administration (NOAA), a division within the United States Department of Commerce, Department of Commerce. History The National Geodetic Survey's 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 Federal government of the United States, U.S. federal government. It became the United States Coast Survey in 1836 and the United States Coast and Geodetic Survey in 1878, the latter name change refle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
American Civil War
The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of America, Confederacy ("the South"), which was formed in 1861 by U.S. state, states that had Secession in the United States, seceded from the Union. The Origins of the American Civil War, central conflict leading to war was a dispute over whether Slavery in the United States, slavery should be permitted to expand into the western territories, leading to more slave states, or be prohibited from doing so, which many believed would place slavery on a course of ultimate extinction. Timeline of events leading to the American Civil War, Decades of controversy over slavery came to a head when Abraham Lincoln, who opposed slavery's expansion, won the 1860 presidential election. Seven Southern slave states responded to Lincoln's victory by seceding f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angle
In Euclidean geometry, an angle can refer to a number of concepts relating to the intersection of two straight Line (geometry), lines at a Point (geometry), point. Formally, an angle is a figure lying in a Euclidean plane, plane 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. More generally angles are also formed wherever two lines, rays or line segments come together, such as at the corners of triangles and other polygons. An angle can be considered as the region of the plane bounded by the sides. Angles can also be formed by the intersection of two planes or by two intersecting curves, in which case the rays lying tangent to each curve at the point of intersection define the angle. The term ''angle'' is also used for the size, magnitude (mathematics), magnitude or Physical quantity, quantity of these types of geometric figures and in this context an a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transit Instrument
In astronomy, a transit instrument is a small telescope with an 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 astrolab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
