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`gst06(`

`jdut`, `jdtt`, `rnpb`)

[SOFA] Returns Greenwich apparent sidereal time in radians consistent
with IAU 2006 resolutions, given the nutation-precession-bias matrix

. `rnpb`

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. `jdut`

and `jdut`

must
have the same dimensions. `jdtt`

must have those
dimensions, too, with two extra dimensions equal to 3 prefixed. The
result has the same dimensions as `rnpb`

.
`jdut`

See also: Astronomical Coordinate Calculations