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 = 0.1120 - 0.0789 cos A - 0.0641 sin A + 0.0159 cos C - 0.0302 sin C
y = 0.3627 - 0.0604 cos A + 0.0756 sin A - 0.0302 cos C - 0.0159 sin C
UT1-UTC = 0.5615 - 0.00127 (MJD - 57780) - (UT2-UT1)
where A = 2*pi*(MJD-57772)/365.25 and C = 2*pi*(MJD-57772)/435.