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  2. Earth-centered inertial - Wikipedia

    en.wikipedia.org/wiki/Earth-centered_inertial

    Due to forces that the Sun and Moon exert, Earth's equatorial plane moves with respect to the celestial sphere. Earth rotates while the ECI coordinate system does not. Earth-centered inertial ( ECI ) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. [ 1 ] "