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numat(epsa, dpsi, deps)
[SOFA] Returns the matrix of nutation based on the mean obliquity of
the date epsa (radians) and the nutation components in
longitude dpsi and obliquity deps (in
radians), with respect to the equinox and ecliptic of date. The mean
obliquity epsa must be consistent with the
precession-nutation models from which dpsi and
deps were obtained. The three arguments must have the
same dimensions. The result has those same dimensions with two extra
dimensions equal to 3 prefixed.
See also: Astronomical Coordinate Calculations