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`fame03(`

`tc`)

[SOFA] Returns the mean longitude of Mercury 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