reference frame determined to provide an inertial reference
NOTE 1 E.g. use the J2000 reference frame as IRF as shown in Figure 3-4.
NOTE 2 The J2000 reference frame (in short for ICRF - Inertial Celestial Reference Frame at J2000 Julian date) is usually defined as Z IRF = earth axis of rotation (direction of north) at J2000 (01/01/2000 at noon GMT), X IRF = direction of vernal equinox at J2000, Y IRF completes the right-handed orthonormal reference frame.
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