Earth-centered inertial | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-13

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Earth-centered_inertial


00:01:28 1 Coordinate system definitions
00:03:51 1.1 J2000
00:04:34 1.2 M50
00:04:55 1.3 GCRF
00:05:14 1.4 MOD
00:05:31 1.5 TEME
00:05:54 1.6 MATLAB
00:06:27 2 See also



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SUMMARY
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Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and do not rotate with respect to the stars. ECI frames are called inertial, in contrast to the Earth-centered, Earth-fixed (ECEF) frames, which remain fixed with respect to Earth's surface in its rotation. It is convenient to represent the positions and velocities of terrestrial objects in ECEF coordinates or with latitude, longitude, and altitude. However, for objects in space, the equations of motion that describe orbital motion are simpler in a non-rotating frame such as ECI. The ECI frame is also useful for specifying the direction toward celestial objects.
The extent to which an ECI frame is actually inertial is limited by the non-uniformity of the surrounding gravitational field. For example, the Moon's gravitational influence on a high-Earth orbiting satellite is significantly different than its influence on Earth, so observers in an ECI frame would have to account for this acceleration difference in their laws of motion. The closer the observed object is to the ECI-origin, the less significant the effect of the gravitational disparity is.