Enum PrecessionAngles 

pub enum PrecessionAngles {
    Iau1976 {
        zeta: Angle,
        z: Angle,
        theta: Angle,
    },
    Iau2000 {
        psia: Angle,
        oma: Angle,
        chia: Angle,
    },
    Iau2006 {
        gamb: Angle,
        phib: Angle,
        psib: Angle,
        epsa: Angle,
    },
}

Precession angles for a specific IAU model.

Variants

Iau1976

IAU1976 precession angles.

Fields

zeta: Angle

Equatorial precession angle zeta_A.

z: Angle

Equatorial precession angle z_A.

theta: Angle

Ecliptic precession angle theta_A.

Iau2000

IAU2000 precession angles.

Fields

psia: Angle

Precession in longitude.

oma: Angle

Precession in obliquity.

chia: Angle

Planetary precession.

Iau2006

IAU2006 Fukushima-Williams precession angles.

Fields

gamb: Angle

First rotation angle (F-W parameterisation).

phib: Angle

Second rotation angle (F-W parameterisation).

psib: Angle

Third rotation angle (F-W parameterisation).

epsa: Angle

Mean obliquity of the ecliptic.

Implementations

impl PrecessionAngles

pub fn iau1976(time: Time<Tt>) -> Self

Computes precession angles using the IAU 1976 (Lieske) model.

pub fn iau2000(time: Time<Tt>) -> Self

Computes precession angles using the IAU 2000 model.

pub fn iau2006(time: Time<Tt>) -> Self

Computes precession angles using the IAU 2006 (Fukushima-Williams) model.

pub fn bias_precession_matrix(&self) -> DMat3

Returns the combined bias-precession rotation matrix.

pub fn precession_matrix(&self) -> DMat3

Returns the precession-only rotation from J2000 to the Mean-of-Date (MOD) frame, without the frame bias.