About: Earth-centered inertial

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Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. "I" in "ECI" stands for inertial (i.e. "not accelerating"), in contrast to the "Earth-centered - Earth-fixed" (ECEF) frames, which remains fixed with respect to Earth's surface in its rotation, and then rotates with respect to stars. 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: In a nutshell:

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rdfs:label	Earth-centered inertial (en) 지구 중심 관성 (ko)
rdfs:comment	지구 중심 관성(Earth-centered inertial, ECI) 좌표계는 지구의 질량중심을 원점으로 하는 좌표계이다. X 축이 춘분점을 향하며, Z 축은 지구의 자전축 방향으로 정의한다. (ko) Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. "I" in "ECI" stands for inertial (i.e. "not accelerating"), in contrast to the "Earth-centered - Earth-fixed" (ECEF) frames, which remains fixed with respect to Earth's surface in its rotation, and then rotates with respect to stars. 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: In a nutshell: (en)
foaf:depiction
dcterms:subject	Astronomical coordinate systems
Wikipage page ID	16553719 (xsd:integer)
Wikipage revision ID	1107096002 (xsd:integer)
Link from a Wikipage to another Wikipage	Cartesian coordinate system Precession Astronomical coordinate systems Right ascension Velocity Declination Earth's rotation Geographic coordinate system Epoch (astronomy) Gravitational field Equinox Longitude Fundamental plane (spherical coordinates) Orbital state vectors Space Two-line element set Acceleration ECEF Earth Ecliptic Altitude North American Aerospace Defense Command North Pole Celestial equator Celestial pole Center of mass March equinox Geocentric Celestial Reference System International Earth Rotation and Reference Systems Service Terrestrial Time Astronomical object Latitude High Earth orbit Spherical coordinate system IRNSS-1B IRNSS-1C IRNSS-1E IRNSS-1F IRNSS-1G IRNSS-1I Nutation Obliquity Object (philosophy) International Celestial Reference Frame Rotation Equation of motion Orbital motion Inertial Earth's axial tilt Geocentric Celestial Reference Frame
sameAs	Earth-centered inertial Earth-centered inertial Earth-centered inertial Earth-centered inertial Earth-centered inertial
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thumbnail	wiki-commons:Special:FilePath/Earth_Centered_Inertial_Coordinate_System.png?width=300
align	left (en)
caption	Earth-centered inertial - Polar view (en) Earth-centered, Earth fixed - Polar view (en)
direction	horizontal (en)
header	An example of Earth-centered frame (en)
image	Animation of IRNSS orbit - Earth fixed - polar view.gif (en) Animation of IRNSS orbit around Earth - Polar view.gif (en)
width	200 (xsd:integer)
has abstract	Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. "I" in "ECI" stands for inertial (i.e. "not accelerating"), in contrast to the "Earth-centered - Earth-fixed" (ECEF) frames, which remains fixed with respect to Earth's surface in its rotation, and then rotates with respect to stars. 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: To represent the positions and velocities of terrestrial objects, it is convenient to use ECEF coordinates or latitude, longitude, and altitude. In a nutshell: * ECI: inertial, not rotating, with respect to the stars; useful to describe motion of celestial bodies and spacecraft. * ECEF: not inertial, accelerated, rotating w.r.t stars; useful to describe motion of objects on Earth surface. 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. (en) 지구 중심 관성(Earth-centered inertial, ECI) 좌표계는 지구의 질량중심을 원점으로 하는 좌표계이다. X 축이 춘분점을 향하며, Z 축은 지구의 자전축 방향으로 정의한다. (ko)
prov:wasDerivedFrom	wikipedia-en:Earth-centered_inertial?oldid=1107096002&ns=0
page length (characters) of wiki page	8023 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Earth-centered_inertial
is Link from a Wikipage to another Wikipage of	Equatorial coordinate system Orbital plane Orbital state vectors Simplified perturbations models Earth-Centered Inertial 24-bit computing Earth-centered, Earth-fixed coordinate system Barycentric and geocentric celestial reference systems ECI Artemis 1 Teme (disambiguation) Neil Ashby Satellite navigation solution

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