=200.= Whilst the Stoics generally were in sympathy with the best astronomical teaching of their time, they combined with it many views based on much cruder forms of observation. Even Seneca thinks it bold to suggest that the sun is not a little larger than the whole earth[63]; and it is commonly held that not only the sun and moon, but also the heavenly bodies generally, feed upon moist exhalations from the Ocean[64]. Cleanthes in particular seems to have viewed the astronomers with suspicion. He alone regarded the moon not as a sphere, but as a hemisphere with the flat side turned towards us[65]; the stars he considered to be conical[66]. These views, very probably derived from Heraclitus, seem to point to the conception of the sky or aether as a single fixed fiery sphere, in which the heavenly bodies only differ from the surrounding element by containing more closely packed masses of fiery matter[67]; a conception which harmonizes far more closely with the Stoic theory of the elements than the doctrines which are astronomically more correct. Cleanthes also explained that the sun could not venture to travel beyond his solstitial positions, lest he should be out of reach of his terrestrial food[68]. And Cleanthes and Posidonius agree that the sun keeps within the ‘torrid zone’ of the sky, because beneath it flows the Ocean, from which the sun sucks up his nutriment[69]. [Sidenote: Deity of the stars.] =201.= From the relation of the heavenly bodies to the element of fire the Stoics draw the conclusion that they are animated, reasoning, self-determined, and divine; in short, that they are gods[70]. This godhead pertains particularly to the sun[71]. Of this doctrine Cleanthes is especially the upholder[72], deeming that the sun is the ruling power in the universe, as reason in man[73]. It is not clear whether the Stoics derived their theory of the divinity of the heavenly bodies from logical deduction, or whether they were here incorporating some Eastern worship. In favour of the latter point of view is the consideration that at this time the association of Mithra with the sun was probably making some progress in the Persian religion, and that the popular names of the seven days of the week, following the names of the sun, moon, and five planets, must have been already current. [Sidenote: Deity of the universe.]