FukushimaWilliamsAngles
Defined in: precession.rs:75
pub struct FukushimaWilliamsAngles { pub gamma_bar: super::Rad, pub phi_bar: super::Rad, pub psi_bar: super::Rad, pub eps_a: super::Rad,}The Fukushima-Williams angles at a given t, all as Rad.
Returned by fukushima_williams. Field order matches ERFA’s
pfw06(date1, date2) -> (gamb, phib, psib, epsa) for easy cross-check.
Only Debug is derived — consumers destructure or access fields
individually through the (Copy) Rad type.
Fields
Section titled “Fields”gamma_bar
Section titled “gamma_bar”gamma_bar: super::Rad
γ̄ — GCRS right ascension of the intersection of the ecliptic
of date with the GCRS equator. TN36 Eq. (5.40) γ̄.
phi_bar
Section titled “phi_bar”phi_bar: super::Rad
φ̄ — obliquity of the ecliptic of date on the GCRS equator.
TN36 Eq. (5.40) φ̄.
psi_bar
Section titled “psi_bar”psi_bar: super::Rad
ψ̄ — precession angle plus bias in longitude along the ecliptic
of date. TN36 Eq. (5.40) ψ̄.
eps_a: super::Rad
ε_A — mean obliquity of date. TN36 Eq. (5.40) ε_A, identical
to the one returned in EclipticPrecessionAngles::eps_a.