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`s2pv(`

`theta`, `phi`, `r`, `td`, `pd`,
`rd`)

[SOFA] Returns the pv-vector that corresponds to the spherical
coordinates longitude

(radians), latitude
`theta`

(radians), radial distance `phi`

, rate of
change of theta `r`

, rate of change of phi
`td`

, rate of change of r `pd`

. All arguments
must have the same dimensions. The result has those same dimensions,
too, but with two extra dimensions equal to 2 and 3 prefixed.
`rd`