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The 'Vishnu Sukta' of the Rig Veda (1.154) says that the first and second of Vishnu's strides (those encompassing the earth and air) are visible to men and the third is in the heights of heaven (sky).
In the Vedas, Vishnu appears not yet included in the class of the Adityas (unless it is implied that he is identical with Surya, and included as the eighth Aditya), but in later texts he appears as heading them.
Cosmologist Patrizia Norelli-Bachelet contends that the 10 Avatars of Vishnu (the Preserver) is a parable of evolution related to the Astrological Ages of fixed signs of the Zodiac (Aquarius, Scorpio, Leo and Taurus).