Expand description
Prime-meridian / spin-angle clocks, plus Earth equinox sidereal time.
Sidereal is a planet-agnostic prime-meridian clock with presets
Sidereal::EARTH, Sidereal::MARS, and Sidereal::MOON. It
evaluates rotation angle and local meridian angle from a linear spin model.
On Earth that angle is the Earth Rotation Angle (ERA, CIO origin). Hour
angle uses the same frame as the angle (HA = local meridian − RA).
Earth equinox sidereal time (GMST, GAST, LMST, LAST) is not a generic
mode of this clock. It is an Earth-only readout of ERA via the IAU 2000/2006
Equation of the Origins / Equinoxes (sidereal-earth):
Sidereal::gmst,
Sidereal::gast,
Sidereal::lmst,
Sidereal::last (see earth).
Modules§
- earth
- Earth equinox sidereal time: GMST, GAST, LMST, LAST (
sidereal-earth). Earth equinox sidereal time (IAU 2000/2006). - earth_
eo_ ee - ERFA Earth equation of the origins / equinoxes (
sidereal-earthfeature).
Structs§
- Sidereal
- Prime-meridian / spin-angle clock for a rotating body.