MODELLING THE EARTH'S ROTATION |
Tabulated models for the Earth orientation / rotation parameters variations | ||||||||||
Useful constants | IERS Conventions
| Models and Softwares | Tidal variations in LOD Compilation done by Ch. Bizouard (Observatoire de Paris) and Laura Fernandez (Facultad de Ciencias Astronomicas y Geofisicas La Plata Argentina). Send your comments to christian.bizouard[at]obspm.fr. Permanent improvements and adds
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Useful constants | geodesy, gravimetry, physics, astronomy : click here | |||||||||
IERS CONVENTIONS | ||||||||||
IERS CONVENTIONS CENTER IERS CONVENTIONS 1996 IERS CONVENTIONS 2003 |
Models, constants related to Earth's rotation and adopted by IERS (conventions 2003 is an up-date of conventions 1996). | |||||||||
Astronomical and geophysical models with associated softwares | ||||||||||
SOFA: Standards of Fundamental Astronomy (Astronomical Sofware packages recommanded by IAU) | ||||||||||
MODELS | CORRESPONDING SOFTWARE | |||||||||
Earth orientation matrix based on Nutation model IAU 2000 | Coordinate transformation from the terrestrial reference system (TRS) to the celestial reference system (CRS) using the IAU 2000 precession-nutation model | Non Rotating Origin algorithm Partial derivatives with respect x,y, UT1, X,Y : nro_partialderiv.f |
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Nutation model IAU 1980 | ||||||||||
Conversion celestial pole offsets UAI 1980 - UAI 2000 | Package of subroutines in order to convert the IAU 1980 celestial pole offsets (dpsi,deps) into the IAU 2000 celestial pole offsets (dpsi,deps,dX,dY) and reciprocally, based upon SOFA matrix transformation. | uai2000.package readme Contact : christian.bizouard[at]obspm.fr |
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Correction for the effect of zonal tides in UT1, LOD and angular velocity,
consistent with the IERS Conventions 2000. |
tver2000.f Contact: christian.bizouard[at]obspm.fr |
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Diurnal and semidiurnal
polar motion/UT1 - IERS conventions 2000 : PM
caused by oceanic tides (71 waves) and lunisolar
torque (10 waves) |
Interpolation of IERS polar motion and UT1 time series, with restoration of diurnal and semi diurnal variations (developped by Observatoire de Paris/NEOS) | interp.f, interp.readme Contact: christian.bizouard[at]obspm.fr |
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TAI - UTC | Computation of the difference TAI-UTC from 1 January 1961 untill now. Very usefull for converting UT1-UTC into UT1-TAI. |
mjd_to_TAIUTC.f |
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Compute the civil date from the (modified) Julian Date and reciprocally | caldat.f Contact: gérard.francou@obspm.fr |