WARNING: The expressions below describe a prediction formulation
that is not recommended for operational use. The expressions will
continue to be provided in order to allow users to implement legacy
procedures. Users are encouraged to explore the possibility of
utilizing the tabular predictions available in the bulletin or in
electronic data files available from the IERS Rapid Service/Prediction
Center located at USNO.
Because of the lower quality of this model, the prediction accuracy
is a few mas to tens of mas worse than the published accuracy of the
prediction model.
x = 0.1065 + 0.0234 cos A + 0.0567 sin A + 0.0091 cos C + 0.0462 sin C
y = 0.3525 + 0.0506 cos A - 0.0170 sin A + 0.0462 cos C - 0.0091 sin C
UT1-UTC = 0.3311 - 0.00101 (MJD - 57206) - (UT2-UT1)
where A = 2*pi*(MJD-57198)/365.25 and C = 2*pi*(MJD-57198)/435.