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• Sun-Centered System —    A theory which states that the Sun is a fixed body at the center of our solar system, and all the other planets revolve around it. This theory was first presented by the Greek, Aristarchus of Samos in the third century BC. Also called the… …   The writer's dictionary of science fiction, fantasy, horror and mythology

• Centered in the Universe — Infobox Film name = Centered in the Universe director = Don Dixon producer = Ann Hassett Bill Murphy writer = Andre Bormanis Don Dixon Ed Krupp music = William Ashford Alan Ett Scott Liggett editing = distributor = Griffith Observatory released …   Wikipedia

• Crystal system — Diamond crystal structure consists of face centered cubic lattice. In crystallography, the terms crystal system, crystal family, and lattice system each refer to one of several classes of space groups, lattices, point groups, or crystals.… …   Wikipedia

• Cubic crystal system — A rock containing three crystals of pyrite (FeS2). The crystal structure of pyrite is simple cubic, and this is reflected in the cubic symmetry of its natural crystal facets …   Wikipedia

• Introduction to the Global Positioning System — The Global Positioning System (GPS) is the only fully functional Global Navigation Satellite System (GNSS). The GPS uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals, that enable GPS… …   Wikipedia

• Reliability centered maintenance — Reliability Centered Maintenance, often known as RCM , is an industrial improvement approach focused on identifying and establishing the operational, maintenance, and capital improvement policies that will manage the risks of equipment failure… …   Wikipedia

• Orthorhombic crystal system — An example of the orthorhombic crystals, aragonite In crystallography, the orthorhombic crystal system is one of the seven lattice point groups. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two …   Wikipedia

• Model-centered instruction — is a general theory of instructional design developed by Andrew S. Gibbons.[1] This theory can be used to design individual and group instruction for all kinds of learning in any type of learning environment. In addition, this theory may be used… …   Wikipedia

• Global Positioning System — GPS redirects here. For other uses, see GPS (disambiguation). Geodesy Fundamentals …   Wikipedia

• 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

• World Geodetic System — The World Geodetic System defines a reference frame for the earth, for use in geodesy and navigation. The latest revision is WGS 84 dating from 1984 (last revised in 2004), which will be valid up to about 2010.Earlier schemes included WGS 72, WGS …   Wikipedia