October 3 – 276
JavaView. Icosahedron. The icosahedron. is a 20-face polyhedron. There are 43,380 distinct nets for the icosahedron. Fifteen golden rectangles span the interior of the icosahedron. These rectangles have 30 edges, and each edge pairs up with its opposite edge to form a golden rectangle. Two icosahedra appear as polyhedral “stars” in M. C. Escher’s 1948 wood engraving “Stars”.
Background – Hubble view of the sunward plunging comet ISON. It was discovered in 2012 by Vitali Nevski and Artyom Novichonok and named after the Russia-based International Scientific Optical Network