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 = 0.1399 - 0.0913 cos A + 0.1160 sin A + 0.0446 cos C - 0.0682 sin C y = 0.3787 + 0.1064 cos A + 0.0861 sin A - 0.0682 cos C - 0.0446 sin C UT1-UTC = 0.0687 + 0.00013 (MJD - 60811) - (UT2-UT1) where A = 2*pi*(MJD-60803)/365.25 and C = 2*pi*(MJD-60803)/435.