Function lupnt::ComputeEopFromSpice

• Defined in File frame_conversions.cc

Function Documentation

SpiceEopParams lupnt::ComputeEopFromSpice(Real t_tdb)

Derives the Earth orientation parameters (x_pole, y_pole, UT1-UTC) at t_tdb directly from SPICE’s “J2000”->”ITRF93” rotation, combined with LuPNT’s IAU 2006/2000A precession-nutation matrix (RotPrecessionNutation). This gives a SPICE-consistent alternative to the IERS-EOP-table-based values returned by GetEopData — useful for epochs not covered by the loaded EOP table, or for comparing/fitting against SPICE’s high-accuracy earth_latest_high_prec.bpc orientation (see InitFrameConversionFromSpice).