ective universe in the intermediate space, circle 2. p. 119 comprising not only the one of which the earth is a part but all the solar systems in the universe. opinions differ as to the arrangement of the globes of this last world, d 1 to d 10 inclusive. the ruler of the fourth world is d 1, called by some the fiery heaven; by others the primum mobile, or the first motion. from this whirling fire