Note 96 — Chapter V

This notion of the seven heavens appears to have been taken from the "seven spheres;" the first of which is that of the Moon; the second, of Mercury; the third, of Venus; the fourth, of the Sun; the fifth, of Mars; the sixth, of Jupiter; and the seventh, of Saturn; each of which orbs was supposed to revolve round the earth in its proper sphere. So also the idea of the seven earths seems to have been taken from the division of the earth into seven climates; a division which has been adopted by several Arab geographers.