Six Decagons and Six Great Circles of a Sphere
Six Decagons and Six Great Circles of a Sphere
Rotate five of six overlapping horizontal circles or decagons around horizontal axes aligned at 72 degrees to each other. When the rotating angle is , where is the golden ratio, the intersections of the circles and the vertices of the decagons are at the vertices of an icosidodecahedron.
2arctan(1/ϕ)
ϕ