Description of the fortran package UAI2000.package (Ch. Bizouard, May 2009) In the frame of the UAI 2000 recommendations and IERS 2003 conventions, the IERS Earth Orientation Center proposes fortran subroutines (iau2000.package) in order to convert the UAI 1980 celestial pole offsets (dpsi,deps)_1980 to the UAI 2000 celestial pole offsets (dpsi,desp)_2000, (dX,dY)_2000 and conversely. Those subroutines are based on up-to-date IERS conventions 2003 and SOFA Fortran package and replace former ones made available in 2002, and suffering of several deficiencies (for precession model especially). Recommended subroutines : (1) subroutine DXDY2000_DPSIDEPS1980(dmjd,dpsi,deps,dX,dY) Transformation of the celestial pole offsets (dpsi,deps)_1980 into the celestial pole offsets (dX,dY)_2000 by using SOFA matrix transformation recommanded by UAI 2000 (Wallace, 2006). input dmjd : modified julian date dpsi : celestial pole offset dpsi / UAI 1980 en mas deps : --------------------- deps ----------------- output dX : celestial pole offset dX / UAI 2000 en mas dY : --------------------- dY ------------------ (2) subroutine DPSIDEPS1980_DXDY2000(dmjd,dX,dY,dpsi,deps) Transformation of the celestial pole offsets (dX,dY)_UAI2000 into the celestial pole offsets (dpsi,deps)_UAI1980 by using SOFA matrix transformation recommanded by UAI 2000 (Wallace, 2006). input dX : celestial pole offset dX / UAI 2000 en mas dY : --------------------- dY ------------------ output dmjd : modified julian date dpsi : celestial pole offset dpsi / UAI 1980 en mas deps : --------------------- deps ----------------- (3) subroutine DPSIDEPS2000_DPSIDEPS1980(dmjd,dpsi,deps,dpsi_2000,deps_2000) Transformation of the celestial pole offsets (dpsi,deps)_1980 into the celestial pole offsets (dpsi,deps)_2000 by using SOFA matrix transformation recommanded by UAI 2000 (Wallace, 2006). input dmjd : modified julian date dpsi : celestial pole offset dpsi / UAI 1980 en mas deps : --------------------- deps ----------------- output dpsi_2000 : celestial pole offset dpsi / UAI 2000 en mas deps_2000 : --------------------- deps ------------------ (4) subroutine DPSIDEPS2000_DXDY2000(dmjd,dX,dY,dpsi,deps) Transformation of the celestial pole offsets (dX,dY)_2000 into the celestial pole offsets (dpsi,deps)_2000 by using SOFA matrix transformation recommanded by UAI 2000 (Wallace, 2006). input dmjd : modified julian date dX : celestial pole offset dX / UAI 2000 en mas dY : --------------------- dY --------------- output dpsi : celestial pole offset dpsi / UAI 2000 en mas deps : --------------------- deps ------------------ (5) subroutine DXDY2000_DPSIDEPS2000(dmjd,dpsi,deps,dX,dY) Transformation of the celestial pole offsets (dpsi,deps)_2000 into the celestial pole offsets (dX,dY)_2000 by using SOFA matrix transformation recommanded by UAI 2000 (Wallace, 2006). input dmjd : modified julian date dpsi : celestial pole offset dpsi / UAI 2000 en mas deps : --------------------- deps ----------------- output dX : celestial pole offset dX / UAI 2000 en mas dY : --------------------- dY --------------- PACKAGE LOCATION : ftp://hpiers.obspm.fr/eop-pc/models/uai2000.package ftp://hpiers.obspm.fr/eop-pc/models/uai2000.package.readme