Vishnupurana 2.9.4

2.9.4

śiśumārākṛti proktaṃ yadrūpaṃ jyotiṣāṃ divi /
nārāyaṇo 'yanaṃ dhāmnāṃ tasyādhāraḥ svayaṃ hṛdi //

THE form of the mighty Hari which is present in heaven, consisting of the constellations, is that of a porpoise, with Dhruva situated in the tail. As Dhruva revolves, it causes the moon, sun, and stars to turn round also; and the lunar asterisms follow in its circular path; for all the celestial luminaries are in fact bound to the polar-star by aerial cords. The porpoise-like figure of the celestial sphere is upheld by Náráyańa, who himself, in planetary radiance, is seated in its heart; whilst the son of Uttanápáda, Dhruva, in consequence of his adoration of the lord of the world, shines in the tail of the stellar porpoise. The upholder of the porpoise-shaped sphere is the sovereign of all, Janárddana. This sphere is the supporter of Dhruva; and by Dhruva the sun is upstayed. Upon the sun depends this world, with its gods, demons, and men. In what manner the world depends upon the sun, be attentive, and you shall hear.