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`c2ixys(`

`x`, `y`, `s`)

[SOFA] Returns the celestial-to-intermediate-frame-of-date matrix for
Celestial Intermediate Pole coordinates

and
`x`

(components of the unit vector in the Geocentric
Celestial Reference System) and Celestial Intermediate Origin locator
`y`

(in radians), which positions the Celestial
Intermediate Origin on the equator of the Celestial Intermediate
Pole. The three arguments must all have the same dimensions. The
returned array has those same dimensions, too, but with two dimensions
equal to 3 prefixed.
`s`

See also: c2ixy, Astronomical Coordinate Calculations