The Indo-European gods are called *deywòs ³those of the day-sky² (Haudry 1987 b: 28 f.), a term whose origins go back to a period in which the Day-sky, *dyéw-pHtér-, was the first among the gods. Hittite Sius ³Sun god² is his most archaic reflex, which retains his temporal character, the limitation of the day. He lost this primacy in those cases where he remained the sky (so the Vedic Dyaùh), whereas his name passed to the sovereign god in the case of the Greeks (Zeùs) and the Romans (Jupiter). To the *deywos of day who inhabit the heavens are opposed the demons whose habitat is the Night-sky or Hell. This theology, initially linked with the revolving-sky-cosmology, is perpetrated in the various dualism which place gods and demons in opposition to one another, such as the Mazdaism of the Iranians. The earth-mother is, in the last state of this theology, the consort of the ³sky², but in more ancient times she was the consort of a black Night-sky who was succeeded by the white Day-sky after the brief reign of a red Dawn- or Dusk-sky. Haudry 1994 http://es.geocities.com/sucellus24/2093.htm the reconstructed proto-Indo-European word for god *deywo-s meant ‘celestial, luminous, radiant’ and located the gods in the sky, associated with the heavenly bodies http://www.usyd.edu.au/hps////////////////////////////////RACP_files/cusack.doc