  There are innumerable stars or geodesics, according to Weyl, that  have the same domain of influence as the arbitrarily chosen star  \(A\); they form, he says, a system that has been causally  interconnected since eternity. Such a system of causally  interconnected stars Weyl describes as stars of a common origin that  lies in an infinitely remote past. The sheaf of world-lines of such a system of stars converges, in the direction of the infinitely remote  past, on an infinitely small part of the total extent of the  hyperboloid, and diverges in the direction of the future on an ever  increasing extent of the hyperboloid. Weyl’s choice of singling out a particular sheaf of non-intersecting timelike geodesics as  constituting the cosmological substratum is the content of Weyl’s  Postulate. Weyl (1923b, 295) says: 