swiveling the nacelle by the nacelle swiveling mechanism based on a wind direction obtained from a measurement result of the anemoscope when {HEAD ~ a wind speed} obtained from {TAIL ~ a measurement result} of the anemometer exceeds a first threshold which is lower than a cut in wind speed; and 
obtained from
swiveling the nacelle by the nacelle swiveling mechanism based on a wind direction obtained from a measurement result of the anemoscope when { HEAD ~ a wind speed } obtained from { TAIL ~ a measurement result } of the anemometer exceeds a first threshold which is lower than a cut in wind speed ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH