Finally, an atlas for deep-sky observers, developed by deep-sky observers—once you’ve seen it, there’s no going back! Pages: 264. Format: Spiralbound, 28 cm × 26 cm. Publisher: Oculum-Verlag. Within each visibility class, objects are labeled in different font sizes and weights with graduated shades and colors for the symbols, so the bolder the label or the darker the symbol, the easier it is to see the object.