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ephemeris data

См. также в других словарях:

  • Ephemeris — An ephemeris (plural: ephemerides; from the Greek word ἐφήμερος ephemeros daily ) is a table of values that gives the positions of astronomical objects in the sky at a given time or times. Different kinds are used for astronomy and astrology.… …   Wikipedia

  • Ephemeris — E*phem e*ris, n.; pl. {Ephemerides}. [L., a diary, Gr. ?, also, a calendar, fr. ?. See {Ephemera}.] 1. A diary; a journal. Johnson. [1913 Webster] 2. (Anat.) (a) A publication giving the computed places of the heavenly bodies for each day of the… …   The Collaborative International Dictionary of English

  • ephemeris — i. A periodical publication tabulating the predicted positions of celestial bodies at regular intervals, such as daily, and containing other data of interest to astronomers. A publication giving similar information useful to a navigator is called …   Aviation dictionary

  • American Ephemeris and Nautical Almanac — The American Ephemeris and Nautical Almanac was published for the years 1855 to 1980, containing information necessary for astronomers, surveyors, and navigators. It was based on the original British publication, The Nautical Almanac and… …   Wikipedia

  • JPL Horizons On-Line Ephemeris System — provides easy access to key solar system data and flexible production of highly accurate ephemerides for solar system objects. Introduction There are 3 ways to use the system: * WWW * Email * Telnet See also * Jet Propulsion Laboratory External… …   Wikipedia

  • Jet Propulsion Laboratory Developmental Ephemeris — The Jet Propulsion Laboratory Developmental Ephemeris (JPL DE) is a product of the Jet Propulsion Laboratory in Pasadena, California. This ephemeris is a system of numerical coefficients (for Chebyshev polynomials) which can be used to calculate… …   Wikipedia

  • Tracking and Data Relay Satellite — A Tracking and Data Relay Satellite (TDRS) is one of a network of communications satellites of the Tracking and Data Relay Satellite System (TDRSS) used by NASA and other United States government agencies for communication to satellites or the… …   Wikipedia

  • GPS signals — Global Positioning System (GPS) satellites broadcast radio signals to enable GPS receivers to determine location and synchronized time. Anatomy of a GPS signal GPS signals include ranging signals, used to measure the distance to the satellite,… …   Wikipedia

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

  • StarFire (navigation system) — StarFire is a wide area differential GPS developed by John Deere s NavCom and Precision Farming groups. StarFire broadcasts additional correction information over satellite L band frequencies around the world, allowing a StarFire equipped… …   Wikipedia

  • Time to first fix — Concerning a Global Positioning System (GPS) receiver, Time To First Fix (TTFF) is a specification detailing the time required for a GPS receiver to acquire satellite signals and navigation data, and calculate a position solution (called a… …   Wikipedia

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