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`num06a(`

`jdtt`)

[SOFA] Returns the matrix for nutation for a given TT Julian Date

, according to the IAU 2006/2000A model. The result
has the same dimensions as `jdtt`

with two dimensions equal
to 3 prefixed. The returned matrix `jdtt``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