Agent skill
iers-conventions-jl
IERSConventions.jl implementing IERS Conventions (1996, 2003, 2010) for Earth orientation, precession, nutation, and terrestrial reference frame rotations. Use when computing Earth rotation matrices, polar motion, sidereal time, or CIO/equinox-based frame transformations.
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/iers-conventions-jl-hammerhead-space-agenticcodingrules
SKILL.md
IERSConventions.jl
IERS Conventions for Earth orientation computations. Repo: JuliaSpaceMissionDesign/IERSConventions.jl
Available Models
| Singleton | Convention | Description |
|---|---|---|
iers1996 |
IERS 1996 | Legacy |
iers2003a |
IERS 2003A | High precision |
iers2003b |
IERS 2003B | Reduced precision |
iers2010a |
IERS 2010A | Current, high precision |
iers2010b |
IERS 2010B | Current, reduced precision |
Frame Rotations
# GCRF -> other frames (pass IERS model as first arg)
D = iers_rot3_gcrf_to_itrf(iers2010b, tt_s) # DCM
D = iers_rot3_gcrf_to_mod(iers2010b, tt_s)
D = iers_rot3_gcrf_to_tod(iers2010b, tt_s)
D = iers_rot3_gcrf_to_pef(iers2010b, tt_s)
D = iers_rot3_gcrf_to_cirf(iers2010b, tt_s)
D = iers_rot3_gcrf_to_tirf(iers2010b, tt_s)
D = iers_rot3_gcrf_to_gtod(iers2010b, tt_s)
# Higher-order derivatives
D, dD = iers_rot6_gcrf_to_itrf(iers2010b, tt_s)
D, dD, ddD = iers_rot9_gcrf_to_itrf(iers2010b, tt_s)
# Inverse rotations
D = iers_rot3_itrf_to_cirf(iers2010b, tt_s)
D = iers_rot3_itrf_to_mod(iers2010b, tt_s)
EOP Data Access
eop_xp(model, tt_c) # Polar motion x [rad]
eop_yp(model, tt_c) # Polar motion y [rad]
eop_lod(model, tt_c) # Length of day [s]
eop_δX(model, tt_c) # CIP correction X [rad]
eop_δY(model, tt_c) # CIP correction Y [rad]
Internal Functions
iers_obliquity(model, tt_c) # Mean obliquity
iers_gmst(model, tt_s) # Greenwich Mean Sidereal Time
iers_gast(model, tt_s) # Greenwich Apparent Sidereal Time
iers_earth_rot_rate(model, tt_c) # Earth rotation rate
Key Conventions
- Time: TT seconds since J2000 (internally converted to centuries where needed)
rot3/6/9/12naming: rotation + Nth-order derivative- Returns DCM from ReferenceFrameRotations.jl
- Registers UT1 timescale with Tempo.jl on package init
- EOP data interpolated via Akima splines from JSMDUtils
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