The polygons of an icosohedron projected on the sky.
There are 20 faces.
Each face is a triangle, specified by 3 vertices.
Each vertex is specified by an azimuth and elevation, in degrees.

unit d

vertices 0 3
   0  90			0  26.56505117707799		72  26.56505117707799		
   0  90			72  26.56505117707799		144  26.56505117707799		
   0  90			144  26.56505117707799		-144  26.56505117707799		
   0  90			-144  26.56505117707799		-72  26.56505117707799		
   0  90			-72  26.56505117707799		0  26.56505117707799		
   0  26.56505117707799		36 -26.56505117707799		72  26.56505117707799		
  72  26.56505117707799		108 -26.56505117707799		144  26.56505117707799		
 144  26.56505117707799		180 -26.56505117707799		-144  26.56505117707799		
-144  26.56505117707799		-108 -26.56505117707799		-72  26.56505117707799		
 -72  26.56505117707799		-36 -26.56505117707799		0  26.56505117707799		
  36 -26.56505117707799		0  26.56505117707799		-36 -26.56505117707799		
 108 -26.56505117707799		72  26.56505117707799		36 -26.56505117707799		
 180 -26.56505117707799		144  26.56505117707799		108 -26.56505117707799		
-108 -26.56505117707799		-144  26.56505117707799		180 -26.56505117707799		
 -36 -26.56505117707799		-72  26.56505117707799		-108 -26.56505117707799		
   0 -90			36 -26.56505117707799		-36 -26.56505117707799		
   0 -90			108 -26.56505117707799		36 -26.56505117707799		
   0 -90			180 -26.56505117707799		108 -26.56505117707799		
   0 -90			-108 -26.56505117707799		180 -26.56505117707799		
   0 -90			-36 -26.56505117707799		-108 -26.56505117707799