enlighten it, they move each one in their peculiar circles; which motion is so just and exact, that neither can hinder or obstruct the other; for they do not exceed their tropicks: and although they should meet, yet we in this world cannot so well perceive them, by reason of the brightness of our sun, which being nearer to us, obstructs the splendor of the sun of the other world, they being too far off to be discerned by our optic perception, except we use very good telescopes; by which, skilful astronomers have often observed two or three suns at once.