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`gmst06(`

`jdut`, `jdtt`)

[SOFA] Returns Greenwich mean sidereal time in radians according to a
model that is consistent with IAU 2006 precession.

is the Julian Date (UT1). `jdut`

is the Julian Date (TT)
of the same instant. `jdtt`

is needed to predict the Earth
rotation, and TT to predict the effects of precession. If
`jdut`

is set equal to `jdtt`

then errors of
order 100 microarcseconds result. Both parameters must have the same
dimensions, and the result has those same dimensions, too.
`jdut`

See also: Astronomical Coordinate Calculations