Struct NutationIAU2000B 

pub struct NutationIAU2000B;

IAU 2000B nutation calculator.

A simplified nutation model using 77 lunisolar terms plus fixed planetary bias corrections. Provides ~1 mas accuracy, suitable for applications not requiring the full precision of NutationIAU2000A.

Example

use celestial_core::nutation::NutationIAU2000B;

let nut = NutationIAU2000B::new();
// Compute nutation for J2000.0 (two-part JD: 2451545.0 + 0.0)
let result = nut.compute(2451545.0, 0.0).unwrap();

// delta_psi and delta_eps are in radians
println!("Δψ = {} rad", result.delta_psi);
println!("Δε = {} rad", result.delta_eps);

Implementations

impl NutationIAU2000B

pub fn new() -> Self

Creates a new IAU 2000B nutation calculator.

pub fn compute(&self, jd1: f64, jd2: f64) -> AstroResult<NutationResult>

Computes nutation angles for a given Julian Date.

Arguments

• jd1 - First part of two-part Julian Date (TDB). Typically the integer part or J2000 epoch (2451545.0).
• jd2 - Second part of two-part Julian Date (TDB). Typically the fractional part or offset from jd1.

The two-part representation preserves precision. The split is arbitrary; jd1 + jd2 must equal the desired Julian Date.

Returns

Returns a NutationResult containing:

• delta_psi: Nutation in longitude (radians)
• delta_eps: Nutation in obliquity (radians)

Both values are IAU 2000B approximations with ~1 mas accuracy.

Trait Implementations

impl Default for NutationIAU2000B

fn default() -> Self

Returns the “default value” for a type.