lox_frames/iers/nutation/iau2000/
iau2000b.rs

1// SPDX-FileCopyrightText: 2023 Angus Morrison <github@angus-morrison.com>
2// SPDX-FileCopyrightText: 2024 Helge Eichhorn <git@helgeeichhorn.de>
3//
4// SPDX-License-Identifier: MPL-2.0
5
6use lox_time::Time;
7use lox_time::julian_dates::JulianDate;
8use lox_time::time_scales::Tdb;
9
10use crate::iers::fundamental::simon1994::{
11    d_simon1994, f_simon1994, l_simon1994, lp_simon1994, omega_simon1994,
12};
13use crate::iers::nutation::Nutation;
14use crate::iers::nutation::iau2000::{DelaunayArguments, luni_solar_nutation};
15
16mod luni_solar;
17mod planetary;
18
19impl Nutation {
20    pub fn iau2000b(time: Time<Tdb>) -> Nutation {
21        let t = time.centuries_since_j2000();
22        let luni_solar_args = DelaunayArguments {
23            l: l_simon1994(t),
24            lp: lp_simon1994(t),
25            f: f_simon1994(t),
26            d: d_simon1994(t),
27            om: omega_simon1994(t),
28        };
29
30        luni_solar_nutation(t, &luni_solar_args, &luni_solar::COEFFICIENTS) + planetary::OFFSETS
31    }
32}
33
34#[cfg(test)]
35mod tests {
36    use lox_core::units::AngleUnits;
37    use lox_test_utils::assert_approx_eq;
38    use lox_time::{Time, time_scales::Tdb};
39
40    use crate::iers::nutation::Nutation;
41
42    #[test]
43    fn test_nutation_iau2000b() {
44        let time = Time::from_two_part_julian_date(Tdb, 2400000.5, 53736.0);
45        let expected = Nutation {
46            dpsi: -9.632_552_291_148_363e-6.rad(),
47            deps: 4.063_197_106_621_159e-5.rad(),
48        };
49        let actual = Nutation::iau2000b(time);
50        assert_approx_eq!(expected, actual, rtol <= 1e-13);
51    }
52}
lox_frames/iers/nutation/iau2000/iau2000b.rs

lox_frames/iers/nutation/iau2000/
iau2000b.rs
