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`fapa03(`

`tc`)

[SOFA] Returns the general accumulated precession in longitude 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