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fapa03

sofars::fundargs

Function fapa03 

Source 
pub fn fapa03(t: f64) -> f64
Expand description

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)