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`fk5hip, `

`r5h`, `s5h`

[SOFA] Returns the FK5-to-Hipparcos rotation

and spin
`r5h`

. `s5h``p_Hipparcos = `

, where
`r5h` p_fk5`p_Hipparcos`

is a p-vector in the Hipparcos frame and
`p_fk5`

is the equivalent FK5 p-vector.

is the
time derivative of the FK5-to-Hipparcos rotation, measured in radians
per Julian TDB year. `s5h`

has 3 by 3 elements,
`r5h`

has 3 elements.
`s5h`

See also: Astronomical Coordinate Calculations