Agent skill
satellitetoolbox-transformations
SatelliteToolboxTransformations.jl for reference frame rotations (ECI/ECEF), geodetic/geocentric conversions, time epoch conversions, and Earth Orientation Parameters. Use when transforming between reference frames (GCRF, J2000, TOD, MOD, TEME, ITRF, PEF), converting geodetic coordinates, or handling EOP data.
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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/satellitetoolbox-transformations-hammerhead-space-agenticcodingrules
SKILL.md
SatelliteToolboxTransformations.jl
Reference frame transformations, geodetic/geocentric conversions, and time epoch handling. Repo: JuliaSpace/SatelliteToolboxTransformations.jl
Frame Selectors (zero-arg functions returning Val singletons)
IAU-76/FK5 ECI: GCRF(), J2000(), TOD(), MOD(), TEME()
IAU-76/FK5 ECEF: ITRF(), PEF()
IAU-2006/2010 ECI: CIRS(), TIRS(), ERS(), MOD06(), MJ2000()
Do NOT mix IAU-76/FK5 and IAU-2006/2010 frames in one transformation.
Frame Rotations
# Get rotation matrix (DCM by default, or Quaternion)
D = r_eci_to_ecef(GCRF(), ITRF(), jd_utc, eop)
D = r_ecef_to_eci(ITRF(), J2000(), jd_utc, eop)
D = r_eci_to_eci(J2000(), MOD(), jd_utc)
Q = r_eci_to_ecef(Quaternion, GCRF(), ITRF(), jd_utc, eop)
# Transform state vectors and orbits directly
sv_ecef = sv_eci_to_ecef(sv, GCRF(), ITRF(), jd_utc, eop)
sv_eci = sv_ecef_to_eci(sv, ITRF(), J2000(), jd_utc, eop)
orb_mod = orb_eci_to_eci(orb, J2000(), MOD(), jd_utc)
EOP is optional for some frame pairs but required for ITRF transformations.
EOP Data
eop = fetch_iers_eop() # IAU-1980 (default)
eop = fetch_iers_eop(Val(:IAU2000A)) # IAU-2000A
Geodetic/Geocentric Conversions
All positions in meters, angles in radians.
(lat, lon, h) = ecef_to_geodetic(r_ecef) # rad, rad, m
r_ecef = geodetic_to_ecef(lat, lon, h) # -> SVector{3}
(lat, lon, r) = ecef_to_geocentric(r_ecef) # rad, rad, m
r_ecef = geocentric_to_ecef(lat, lon, r) # -> SVector{3}
(phi_gc, r) = geodetic_to_geocentric(phi_gd, h)
(phi_gd, h) = geocentric_to_geodetic(phi_gc, r)
Time Conversions
jd_ut1 = jd_utc_to_ut1(jd_utc, eop)
jd_tt = jd_utc_to_tt(jd_utc)
DeltaAT = get_Deltaat(jd) # Accumulated leap seconds
Key Conventions
- Units: meters, m/s, radians, Julian Day
- Re-exports SatelliteToolboxBase (all base types/constants available)
- DCM output by default; pass
Quaternionas first arg for quaternion output
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