use super::pn00b::pn00b;

///  Form the matrix of precession-nutation for a given date (including

///  frame bias), equinox-based, IAU 2000B model.

///

///  Given:

///     date1,date2 f64          TT as a 2-part Julian Date (Note 1)

///

///  Returned (function value):

///                 [[f64; 3]; 3] bias-precession-nutation matrix (Note 2)

///

///  Notes:

///

///  1) The TT date date1+date2 is a Julian Date, apportioned in any

///     convenient way between the two arguments.  For example,

///     JD(TT)=2450123.7 could be expressed in any of these ways,

///     among others:

///

///            date1          date2

///

///         2450123.7           0.0       (JD method)

///         2451545.0       -1421.3       (J2000 method)

///         2400000.5       50123.2       (MJD method)

///         2450123.5           0.2       (date & time method)

///

///     The JD method is the most natural and convenient to use in

///     cases where the loss of several decimal digits of resolution

///     is acceptable.  The J2000 method is best matched to the way

///     the argument is handled internally and will deliver the

///     optimum resolution.  The MJD method and the date & time methods

///     are both good compromises between resolution and convenience.

///

///  2) The matrix operates in the sense V(date) = rbpn * V(GCRS), where

///     the p-vector V(date) is with respect to the true equatorial triad

///     of date date1+date2 and the p-vector V(GCRS) is with respect to

///     the Geocentric Celestial Reference System (IAU, 2000).

///

///  3) A faster, but slightly less accurate, result (about 1 mas), than

///     the iauPnm00a function.

///

///  Called:

///     iauPn00b     bias/precession/nutation, IAU 2000B

///

///  Reference:

///

///     Capitaine, N., Chapront, J., Lambert, S. and Wallace, P.,

///     "Expressions for the Celestial Intermediate Pole and Celestial

///     Ephemeris Origin consistent with the IAU 2000A precession-

///     nutation model", Astron.Astrophys. 400, 1145-1154 (2003)

pub fn pnm00b(date1: f64, date2: f64) -> [[f64; 3]; 3] {

    /* Obtain the required matrix (discarding other results). */

    let (_, _, _, _, _, _, _, rbpn) = pn00b(date1, date2);

    rbpn

}