These points are so located that a horizontal line 85 through point 83 intersects the plane of {HEAD ~ reflectors} 73 and 75 at {TAIL ~ the same point} 86 as does the line 87 passing through point 84 at 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 { HEAD ~ reflectors } 73 and 75 at { TAIL ~ the same point } 86 as does the line 87 passing through point 84 at 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 HEAD HEAD HEAD HEAD HEAD OTH OTH OTH 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 OTH OTH OTH