public static function Gst00b($uta, $utb) {
    $gmst00;
    $ee00b;
    $gst;

    $gmst00 = IAU::Gmst00($uta, $utb, $uta, $utb);
    $ee00b  = IAU::Ee00b($uta, $utb);
    $gst    = IAU::Anp($gmst00 + $ee00b);

    return $gst;
  }