Commentary Par XX 6

According to Dante's astronomy, stars did not glow with their own energy, but derived their light from the Sun (see Conv.III.xii.7): '... il sole.  Lo quale di sensibile luce sé prima e poi tutte le corpora celestiali e [le] elementali allumina' (the Sun, which illuminates with perceptible light first itself and then all the celestial and elemental bodies [tr. R. Lansing]).