These points are so located that a horizontal line 85 through point 83 intersects the plane of reflectors 73 and 75 at {TAIL ~ the same point} 86 as does the line 87 passing through point 84 at {HEAD ~ an angle α}, equal to the maximum solar altitude 
These points are so located that a horizontal line 85 through point 83 intersects the plane of reflectors 73 and 75 at { TAIL ~ the same point } 86 as does the line 87 passing through point 84 at { HEAD ~ an angle α } , equal to the maximum solar altitude
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH