In this manner, {HEAD ~ the swivelled panel} 3 can be guided to follow {TAIL ~ the solar altitude} 
In this manner , { HEAD ~ the swivelled panel } 3 can be guided to follow { TAIL ~ the solar altitude }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL