/rust/registry/src/index.crates.io-1949cf8c6b5b557f/sofars-0.6.1/src/fundargs/fasa03.rs

Source
use crate::consts::D2PI;
use std::ops::Rem;

/// Fundamental argument, IERS Conventions (2003):
/// mean longitude of Saturn.
///
/// Status:  canonical model.
///
/// Given:
///    t     f64    TDB, Julian centuries since J2000.0 (Note 1)
///
/// Returned (function value):
///          f64    mean longitude of Saturn, radians (Note 2)
///
/// Notes:
///
/// 1) Though t is strictly TDB, it is usually more convenient to use
///    TT, which makes no significant difference.
///
/// 2) The expression used is as adopted in IERS Conventions (2003) and
///    comes from Souchay et al. (1999) after Simon et al. (1994).
///
/// References:
///
///    McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
///    IERS Technical Note No. 32, BKG (2004)
///
///    Simon, J.-L., Bretagnon, P., Chapront, J., Chapront-Touze, M.,
///    Francou, G., Laskar, J. 1994, Astron.Astrophys. 282, 663-683
///
///    Souchay, J., Loysel, B., Kinoshita, H., Folgueira, M. 1999,
///    Astron.Astrophys.Supp.Ser. 135, 111
pub fn fasa03(t: f64) -> f64 {
    /* Mean longitude of Saturn (IERS Conventions 2003). */
    (0.874016757 + 21.3299104960 * t).rem(D2PI)
}

Coverage Report

Created: 2026-05-16 06:09

Line	Count	Source
1		use crate::consts::D2PI;
2		use std::ops::Rem;
3
4		/// Fundamental argument, IERS Conventions (2003):
5		/// mean longitude of Saturn.
6		///
7		/// Status: canonical model.
8		///
9		/// Given:
10		/// t f64 TDB, Julian centuries since J2000.0 (Note 1)
11		///
12		/// Returned (function value):
13		/// f64 mean longitude of Saturn, radians (Note 2)
14		///
15		/// Notes:
16		///
17		/// 1) Though t is strictly TDB, it is usually more convenient to use
18		/// TT, which makes no significant difference.
19		///
20		/// 2) The expression used is as adopted in IERS Conventions (2003) and
21		/// comes from Souchay et al. (1999) after Simon et al. (1994).
22		///
23		/// References:
24		///
25		/// McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
26		/// IERS Technical Note No. 32, BKG (2004)
27		///
28		/// Simon, J.-L., Bretagnon, P., Chapront, J., Chapront-Touze, M.,
29		/// Francou, G., Laskar, J. 1994, Astron.Astrophys. 282, 663-683
30		///
31		/// Souchay, J., Loysel, B., Kinoshita, H., Folgueira, M. 1999,
32		/// Astron.Astrophys.Supp.Ser. 135, 111
33	0	pub fn fasa03(t: f64) -> f64 {
34		/* Mean longitude of Saturn (IERS Conventions 2003). */
35	0	(0.874016757 + 21.3299104960 * t).rem(D2PI)
36	0	}