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| Keywords: Earth Centered Inertial Coordinate System.png en To show a location about the earth using the ECI system; the Cartesian Coordinates are used The x-y plane coincides with the Earth ™s equatorial plane The x axis is permanently fixed in a direction relative to the celestial sphere which does not rotate like the Earth does The z axis lies at a 90ï‚° angle to the equatorial plane and extends through the North Pole The Earth rotates the ECI Coordinate system does not Due to forces exerted from the sun and moon the Earth ™s equatorial plane moves with respect to the celestial sphere Since our measurements are calculated relative to satellite positions this movement will cause error to position solutions if the ECI system were used 2003-09-21 FAA Academy Training Manual - GPS concepts Course 44221 U S Department of Transportation Federal Aviation Administration - Airway Facilities Division PD-USGov Check categories 2011 September 23 en wikipedia Earth-centered_inertial 2 Uploaded with UploadWizard Celestial coordinate systems | ||||
