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Pole, his right foot to the (unseen) South Pole. leaving his third step to fall on the head of Bali (in this version, Orion). Here Vamana would have arrived at Bali’s sacrifice on the winter solstice, when the sun is a “dwarf” because he cannot stretch his feet (rays) all the way to the North Pole. The three steps could also apply to the system of reckoning which takes one human year to equal one day and night of the devas. When during this period the Sun moves from the vernal equinox to the autumnal equinox (during which time it appears above the celestial equator in the sky), it is day for the devas and night for the asuras, and when the Sun moves from the autumnal equinox to the vernal equinox (during which time it appears below the celestial equator in the sky), it becomes night tor the devas and day for the asuras. While the asuras rule during their day the devas are discomfited, but with the coming of the vernal equinox (sunrise on the day of the devas) the order of the universe is renewed through noon (the summer solstice) until sunset (the autumnal equinox), after which the asuras again get their chance to play about. Bali
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Robert E. Svoboda (The Greatness of Saturn: A Therapeutic Myth)