[5]. fyr, fire. In the old astronomy, the region of air was supposed to be surrounded by a region of fire, which Boethius here says was caused by the swift motion of the ether: 'Quique agili motu calet aetheris Transcendit ignis uerticem.' Beyond this region were the planetary spheres, viz. those of the moon, Mercury, Venus, the sun, Mars, Jupiter, and Saturn. This explains the allusion to the passage of Thought (Imagination) through 'the houses that bear the stars' (i. e. planets), in Latin astriferas domos, and so, past the sun, to the seventh sphere of Saturn. After this, Thought soars to the eighth sphere, called the Sphere of the Fixed Stars (denoted below by 'the circle of the stars' or 'the firmament'); and after 'wending on the back of it,' i. e. getting beyond it, reaches the primum mobile, where 'the lord of kings holds the sceptre of his might.'
'Donec in astriferas surgat domos,
Phoeboque coniungat uias,
Aut comitetur iter gelidi senis
Miles corusci sideris;
Vel quocunque micans nox pingitur,
Recurrat astri circulum,
Atque ubi iam exhausti fuerit satis,
Polum relinquit extimum,
Dorsaque uelocis premat aetheris