Chapter 8: Tidal variations in the Earth's rotation
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- ORTHO_EOP.F - Subroutine to compute the diurnal and semidiurnal variations in the Earth orientation. Calls subroutine CNMTX. 
- CNMTX.F - Subroutine called by ORTHO_EOP to compute the time dependent part of the second degree diurnal and semidiurnal tidal potential.
- RG_ZONT2.F - Subroutine to compute the effects of zonal Earth tides on the rotation of the Earth. Calls subroutine FUNDARG.
- FUNDARG.F - Subroutine to compute the lunisolar fundamental arguments from the model. 
 Provided by R. Eanes
 Provided by R. Gross
 Provided by Simon et al. (1994)