EphemerisFrameBridge
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Defined in: transform.rs:114
pub trait EphemerisFrameBridge: [Eci](../eci/) + [Sized](https://doc.rust-lang.org/std/marker/trait.Sized.html) + 'staticECI frame that a GCRS ephemeris vector can be rotated into, for frame-correct third-body / SRP forces.
The analytic Sun/Moon/planet ephemerides return positions in
Gcrs(crate::frame::Gcrs). A force model integrating in frame F must
express that position in F before differencing it with the satellite state.
This trait supplies the GCRS → F rotation so the force model can be written
once, frame-generically, instead of inheriting a raw-vector mix that is only
valid for GCRS-aligned frames. A frame without this impl cannot be used with
those forces (a compile error), which is the point: a new of-date frame must
state its GCRS → F rotation rather than silently reuse the raw treatment.
Implementations
Section titled “Implementations”SimpleEci/Gcrs: identity.Gcrsis the ephemeris frame;SimpleEciis the simple/visualization-grade frame (no precession/nutation/bias model, and no strict relation to GCRS — seeSimpleEci(crate::frame::SimpleEci)), so the analytic ephemeris is treated as already expressed in it, preserving the historical Meeus/simple-path behavior exactly.Cirs: the EOP-free IAU 2006 model GCRS→CIRS rotation (precession + nutation), rotating the ephemeris into the of-date intermediate frame.
EOP is intentionally not a parameter, matching EarthRotationPole: the
model CIP is sub-milliarcsecond, negligible next to the ~arcminute accuracy
of the analytic ephemerides this serves.
Required Methods
Section titled “Required Methods”ephemeris_rotation()
Section titled “ephemeris_rotation()”fn ephemeris_rotation(utc: &[Epoch<Utc>](../../structs/epoch/)) -> [Rotation<frame::Gcrs, Self>](../../structs/rotation/)
Rotation carrying a GCRS ephemeris vector into this frame at utc.