Cartesian coordinate system — Illustration of a Cartesian coordinate plane. Four points are marked and labeled with their coordinates: (2, 3) in green, (−3, 1) in red, (−1.5, −2.5) in blue, and the origin (0, 0) in purple. A Cartesian coordinate system specifies each point… … Wikipedia
Homogeneous coordinate system — A homogeneous coordinate system is a coordinate system in which there is an extra dimension, used most commonly in computer science to specify whether the given coordinates represent a vector (if the last coordinate is zero) or a point (if the… … Wikipedia
Coordinate time — In the theory of relativity, it is convenient to express results in terms of a spacetime coordinate system relative to an implied observer. In many (but not all) coordinate systems, an event is specified by one time coordinate and three spatial… … Wikipedia
Coordinate conditions — In general relativity, the laws of physics can be expressed in a generally covariant form. In other words, the real world does not care about our coordinate systems. However, it is often useful to fix upon a particular coordinate system, in order … Wikipedia
System time — Unix date command In computer science and computer programming, system time represents a computer system s notion of the passing of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system… … Wikipedia
Page Interchange Language — Publishing Interchange Language, or PIL is a public domain language that allows precise description of the layout of content on pages, groups of multiple pages or any 2 dimensional area, which it calls a canvas. It was developed between June 1990 … Wikipedia
Geodetic system — For other uses, see Geodetic. Geodesy Fundamentals … Wikipedia
Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals … Wikipedia
Irish grid reference system — The Irish grid reference system is a system of geographic grid references commonly used in Ireland (both Northern Ireland and the Republic of Ireland). The Irish grid overlaps the British grid.UsageIn general, neither Ireland nor Great Britain… … Wikipedia
Maidenhead Locator System — The Maidenhead Locator System is a geographic coordinate system used by amateur radio operators. Dr. John Morris, G4ANB, originally devised the system, and a group of VHF managers, meeting in Maidenhead, England in 1980, adopted it. The… … Wikipedia
Public Land Survey System — Seal of the BLM The Public Land Survey System (PLSS) is a method used in the United States to survey and identify land parcels, particularly for titles and deeds of rural, wild or undeveloped land. Its basic units of area are the township and… … Wikipedia