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/// Fundamental argument, IERS Conventions (2003):
/// general accumulated precession in longitude.
///
/// Given:
/// * t TDB, Julian centuries since J2000.0 (Note 1)
///
/// Returned (function value):
/// * 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)
///
/// This revision: 2021 May 11