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eraFapa03

rv = ERFA.fapa03(t)

Fundamental argument, IERS Conventions (2003): general accumulated precession in longitude.

Given:

   t     double    TDB, Julian centuries since J2000.0 (Note 1)

Returned (function value):

         double    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

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