The “Doors of Heaven" are the entrances to the celestial realm which only open and close at the passage of the sun god and the blessed dead in his following during their diurnal and nocturnal journeys. Texts and vignettes that came to us from ancient Egypt in the form of funerary books mention and depict the doors of heaven in different ways.  The signs of the two aspects of time, nHH and D.t, along with the deities associated with them are among the motifs portrayed and related to the portals of the sky.  The research studies the relationship between nHH and D.t with the Doors of Heaven as well as the purpose and the religious significance of the representation of their symbols on the entrances to the eastern and western horizons of the sky and how this depiction contributes to the success of the daily voyage of the solar deity.