Thus in ancient India the holy fire was kindled anew each morning, and honoured with ritualistic observances (Agnihotra). This took place, however, with special ceremony at the time of the winter solstice, when the days began again to increase (Agnistoma). They then celebrated the end of the time "of darkness," the Pitryana, or time of the Manes, during which the worship of the Gods had been at a standstill. Then the Angiras, the priestly singers, summoned the Gods to be present, greeting with loud song the beginning of the "holy" season, the Devayana, with which the new light arose. Agni and the other Gods again returned to men, and the priests announced to the people the "joyful tidings" (Evangelium) that the Light God had been born again. As Hillebrand has shown, this festival also indicates the memory of an earlier home in the North whence the Aryan tribes had migrated, since in India, where the shortest and longest days only differ by about four hours, no reason exists for celebrating the "return" of the light. [158] Indeed, it appears that we have to do here with a rite which reaches back into the very origins of all human civilisation, and preserves the memory of the discovery of fire in the midst of the horrors of the Stone Age. There is no doubt that we have before us in the Vedic Agni Cult the original source of all the stories of the birth of the Fire-Gods and Sun-Gods. These Gods usually enter life in darkness and concealment. Thus the Cretan Zeus was born in a cavern, Mithras, Dionysus, and Hermes in a gloomy grotto, Horus in the "stable" (temple) of the holy cow (Isis)--Jesus, too, was born at dead of night in a lowly "stable" [159] at Bethlehem. The original ground for this consists in the fact that Agni, in the form of a spark, comes into existence in the dark hollow of the hole bored in the stick. The Hymns of the Rigveda often speak of this "secret birth" and of the "concealment" of Agni. They describe the Gods as they set out in order to seek the infant. They make the Angiras discover it "lying in concealment," and it grows up in hiding. [160] But the idea of the Fire-God being born in a "stable" is also foreshadowed in the Rigveda. For not only are the vessels of milk and butter ready for the anointing compared with cows, but Ushas, too, the Goddess of Dawn, who is present at the birth, is called a red milch-cow, and of men it is said that they flocked "like cows to a warm stable" to see Agni, whom his mother held lovingly upon her lap. [161]