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`gd2gce(`

`eph`, `a`, `f`)

[SOFA] Returns geocentric coordinates (x, y, z) corresponding to
geodetic coordinates

(east longitude in radians,
north latitude in radians, height) for the reference ellipsoid with
equatorial radius `eph`

and flattening `a`

.
`f`

, the height, and the returned coordinates x, y, z are
all in the same units. `a`

must have 3 elements in its
first dimension. `eph`

and `a`

must have exactly
one element. The result has the same dimensions as `f`

.
`eph`

See also: Astronomical Coordinate Calculations