Compute the Earth rotation matrix / quaternion |
2025 2 18 2 h 16 min 47 s UTC
Matrix ITRF -> ICRF:
-0.99927454531230 0.03800535363817 0.00244462384122
-0.03800537220252 -0.99927753410769 0.00003887687556
0.00244433521328 -0.00005406016683 0.99999701114697
Quaternion (q1, q2, q3, q4):
-0.01900612879426 0.00122246149385 -0.00000379651143 0.99981861987149
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. 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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