/rust/registry/src/index.crates.io-1949cf8c6b5b557f/sofars-0.6.1/src/fundargs/fapa03.rs

Source
/// Fundamental argument, IERS Conventions (2003):
/// general accumulated precession in longitude.
///
/// Status:  canonical model.
///
/// Given:
///    t     f64    TDB, Julian centuries since J2000.0 (Note 1)
///
/// Returned (function value):
///          f64    general precession in longitude, 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).  It
///    is taken from Kinoshita & Souchay (1990) and comes originally
///    from Lieske et al. (1977).
///
/// References:
///
///    Kinoshita, H. and Souchay J. 1990, Celest.Mech. and Dyn.Astron.
///    48, 187
///
///    Lieske, J.H., Lederle, T., Fricke, W. & Morando, B. 1977,
///    Astron.Astrophys. 58, 1-16
///
///    McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
///    IERS Technical Note No. 32, BKG (2004)
pub fn fapa03(t: f64) -> f64 {
    /* General accumulated precession in longitude. */
    (0.02438175 + 0.00000538691 * t) * t
}

Coverage Report

Created: 2026-09-04 06:48

Line	Count	Source
1		/// Fundamental argument, IERS Conventions (2003):
2		/// general accumulated precession in longitude.
3		///
4		/// Status: canonical model.
5		///
6		/// Given:
7		/// t f64 TDB, Julian centuries since J2000.0 (Note 1)
8		///
9		/// Returned (function value):
10		/// f64 general precession in longitude, radians (Note 2)
11		///
12		/// Notes:
13		///
14		/// 1) Though t is strictly TDB, it is usually more convenient to use
15		/// TT, which makes no significant difference.
16		///
17		/// 2) The expression used is as adopted in IERS Conventions (2003). It
18		/// is taken from Kinoshita & Souchay (1990) and comes originally
19		/// from Lieske et al. (1977).
20		///
21		/// References:
22		///
23		/// Kinoshita, H. and Souchay J. 1990, Celest.Mech. and Dyn.Astron.
24		/// 48, 187
25		///
26		/// Lieske, J.H., Lederle, T., Fricke, W. & Morando, B. 1977,
27		/// Astron.Astrophys. 58, 1-16
28		///
29		/// McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
30		/// IERS Technical Note No. 32, BKG (2004)
31	0	pub fn fapa03(t: f64) -> f64 {
32		/* General accumulated precession in longitude. */
33	0	(0.02438175 + 0.00000538691 * t) * t
34	0	}