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15.5.260 fw2xy

fw2xy, gamma_bar, phi_bar, psi, eps, x, y

[SOFA] Returns CIP x, y, given the Fukushima-Williams bias-precession-nutation angles gamma_bar, phi_bar, psi, eps. All of the input and output parameters are measured in radians. They all have the same dimensions.

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