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faf03(tc)
[SOFA] Returns the mean longitude of the Moon minus the mean longitude
of the ascending node in radians, a fundamental argument according to
the iers conventions of 2003, as a function of the number
tc of Julian centuries since J2000.0 TDB. It makes no
practical difference if tc is measured since J2000.0 TT
instead. The result has the same dimensions as tc.
See also: Astronomical Coordinate Calculations