Greenwich Mean Sidereal Time (radians, 0..2π) for a Julian Date — the angle the Earth has turned under the inertial frame. IAU-82 series, matching the gstime used inside SGP4 so the rotation and the propagator agree.
gstime
Greenwich Mean Sidereal Time (radians, 0..2π) for a Julian Date — the angle the Earth has turned under the inertial frame. IAU-82 series, matching the
gstimeused inside SGP4 so the rotation and the propagator agree.