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`nutm80(`

`jdtdb`)

[SOFA] Returns the nutation matrix for TDB Julian Date

, 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 `jdtdb``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