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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

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`

.
`tc`

See also: Astronomical Coordinate Calculations