Compute the Earth rotation matrix / quaternion |
2025 4 26 3 h 50 min 00 s UTC
Matrix ITRF -> ICRF:
0.02760873397492 0.99961577919310 0.00246003993316
-0.99961880581439 0.02760872299511 0.00003842896106
-0.00002950436522 -0.00246016315520 0.99999697335879
Quaternion (q1, q2, q3, q4):
-0.71680095394901 0.00087143861294 -0.00086828298870 0.69727675932673
Transformation coordinate M from the international terrestrial reference system (ITRF) to the international celestial reference frame (ICRF) : Celestial coordinates ( X Y Z) = M x Terrestrial coordinates ( x y z ) and associated quaternion of rotation (Bizouard et Cheng, 2023). . Compution of Celestial Pole coordinates (X,Y), Earth rotation angle, Celestial Intermediate Origin locator, Terrestrial Intermediate Origin locator are performed by FORTRAN programs of the SOFA IAU library, consistent with the IAU 2000/2006 resolutions.
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