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nutm80(jdtdb)
[SOFA] Returns the nutation matrix for TDB Julian Date
jdtdb, according to the IAU 1980 model. The result has
the same dimensions as jdtdb with two extra dimensions
equal to 3 prefixed. The returned matrix m can be used as
follows: v(true) = m v(mean) where p-vector v(true) is
with respect to the true equatorial triad of date and the p-vector
v(mean) is with respect to the mean equatorial triad of date.
See also: Astronomical Coordinate Calculations