So far mythologists have always helped themselves out with solar, lunar, meteorological, vegetal, and other ideas of the kind.
The fact that myths are first and foremost psychic phenomena that reveal the nature of the soul is something they have absolutely refused to see until now.
Primitive man is not much interested in objective explanations of the obvious, but he has an imperative need—or rather, his unconscious psyche has an irresistible urge—to assimilate all outer sense experiences to inner, psychic events.
It is not enough for the primitive to see the sun rise and set; this external observation must at the same time be a psychic happening: the sun in its course must represent the fate of a god or hero who, in the last analysis, dwells nowhere except in the soul of man.
All the mythologized processes of nature, such as summer and winter, the phases of the moon, the rainy seasons, and so forth, are in no sense allegories of these objective occurrences; rather they are symbolic expressions of the inner, unconscious drama of the psyche which becomes accessible to man’s consciousness by way of projection—that is, mirrored in the events of nature. ~Carl Jung, CW 9i, Para 7