Amongst all nations except the Chinese, where it was political, and the Greeks, where it was purely speculative, astronomy has been intimately mixed with religious ideas, and we consequently find it to have taken considerable hold on the mind. Just as we have seen among the Indians that the basis of their astronomical ideas was the two-fold division into heaven and earth, so among other nations this duality has formed the basis of their religion. Two aspects of things have been noticed by men in the constitution of things--that which remains always, and that which is merely transitory, causes and effects. The heaven and the earth have presented the image of this to their minds--one being the eternal existence, the other the passing form. In heaven nothing seems to be born, increase, decrease, or die above the sphere of the moon. That alone showed the traces of alteration in its phases; while on the other hand there was an image of perpetuity in its proper substance, in its motion, and the invariable succession of the same phases. From another point of view, the heavens were regarded as the father, and the earth as the mother of all things. For the principle of fertility in the rains, the dew and the warmth, came from above; while the earth brought forth abundantly of the products of nature. Such is the idea of Plutarch, of Hesiod, and of Virgil. From hence have arisen the fictions which have formed the basis of theogony. Uranus is said to have espoused Ghe, or the heavens took the earth to wife, and from their marriage was born the god of time or Saturn. Another partly religious, and partly astronomical antagonism has been drawn between light and darkness, associated respectively with good and evil. In the days when artificial lights, beyond those of the flickering fire, were unknown, and with the setting of the sun all the world was enveloped in darkness and seemed for a time to be without life, or at least cut off entirely from man, it would seem that the sun and its light was the entire origin of life. Hence it naturally became the earliest divinity whose brilliant light leaping out of the bosom of chaos, had brought with it man and all the universe, as we see it represented in the theologies of Orpheus and of Moses; whence the god Bel of the Chaldeans, the Oromaza of the Persians, whom they invoke as the source of all that is good in nature, while they place the origin of all evil in darkness and its god Ahrinam. We find the glories of the sun celebrated by all the poets, and painted and represented by numerous emblems and different names by the artists and sculptors who have adorned the temples raised to nature or the great first cause.