astroforge.coordinates.TIRSToITRS#
- astroforge.coordinates.TIRSToITRS(mjd, X)[source]#
Rotate a cartesian vector from the Terrestrial Intermediate Reference System (TIRS) to the International Terrestrial Reference System (TIRS). TIRS and ITRS only differ by the polar motion.
- Parameters:
mjd (float) – Time at which to evaluate the polar motion, expressed as a Modified Julian Date (MJD) in the UT1 time system.
X (NDArray[np.float64]) – Vector to be rotated, should have shape (3, )
- Returns:
Y – Rotated vector
- Return type:
NDArray[np.float64]