Preliminary Science

The term falak applies to any round quantity of a globular body or surface or of the surface (area) of the circumfrance of a circale,' the body surrounding the world, which turns about the centre(viz.' of Earth) is called in particular falak, and this falak is divided into many parts, but first and foremost into seven parts, which are sphereical bodies(i.e shalls) contiguous with one another in such a way that each one of them surrounds the next one, the concave surface of the surrounding (spherical shell) touching the convex surface of the one surrounded by it. The centre of all these spheres is the centre of the world, and each one of them individually is called, "falak".