15.5.449 pom00

pom00(xp, yp, sp)

[SOFA] Returns the matrix of polar motion, IAU 2000, given the coordinates xp, yp of the pole and tio locator sp, all in radians. The tio locator positions the Terrestrial Intermediate Origin on the equator. It is obtained from polar motion observations, so is in essence unpredictable. The current function implements an approximation based on the dominant secular drift of about 47 microarcseconds per century. All arguments must have the same dimensions. The result has those same dimensions as well, with two dimensions equal to 3 prefixed.

See also: Astronomical Coordinate Calculations