There is much to say about Aeschylus' Hepta, which is clearly an astronomical allegory along the lines of the Oresteia, which it predates by about nineteen years. Whereas in the Oresteia the allegorical value of the Athenian Apollonian miracle is borne by the radiant moon (Orestes) as reflective of the sun's rays, in the earlier Hepta it is borne by the sun itself, with the battle for the city portraying the drama of the skies at dawn. There are many specific parallels with Sophocles' Theban trilogy. For a detailed exposition of this fascinating story, please read my analysis: