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`fae03(`

`tc`)

[SOFA] Returns the mean longitude of the Earth 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