c2t00b(jdtt, jdut, xp, yp)
[SOFA] Returns the celestial-to-terrestrial matrix, given TT Julian
jdtt, UT1 Julian Date
jdut, and polar
yp, using the IAU 2000B
jdut should express the same
instants of time: the first one in the TT timescale, and the second
one in the UT1 timescale.
xp, yp are the
coordinates (in radians) of the Celestial Intermediate Pole with
respect to the International Terrestrial Reference System measured
along the meridians to 0 and 90 degrees west, respectively, for those
same instants. All four arguments must have the same dimensions.
The result gets the same dimensions as all of the parameters, with two dimensions equal to 3 prefixed.
c2t00a yields slightly more accurate results, but slower.
See also: c2t00a, c2t06a, Astronomical Coordinate Calculations