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`fw2xy, `

`gamma_bar`, `phi_bar`, `psi`, `eps`,
`x`, `y`

[SOFA] Returns CIP

, `x`

, given the
Fukushima-Williams bias-precession-nutation angles
`y`

, `gamma_bar`

, `phi_bar`

,
`psi`

. All of the input and output parameters are measured
in radians. They all have the same dimensions.
`eps`

If `e`

is the J2000.0 ecliptic pole, `p`

is the GCRS pole,
`e`

is the ecliptic pole of the date, and `p`

is the CIP,
then the four Fukushima-Williams angles are: `gamma_bar = epE`

,
`phi_bar = pE`

, `psi = pEP`

, and `eps = ep`

.

See also: Astronomical Coordinate Calculations