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The Orbits of the Planets
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the well-being of the inhabitants of the universe. They circummanbulate the supreme abode of Lord Viṣṇu, known as Dhruvaloka, the polestar.
PURPORT
Śrila Madhvācārya quotes the following verse from the  Brahmāṇḍa Purāṇa :
jñānānandātmano viṣṇuḥ 
    śiśumāra-vapuṣy atha 
    ūrdhva-lokeṣu sa vyāpta 
    ādityādyās tad-āśritā
Lord Viṣṇu, who is the source of knowledge and transcendental bliss, has assumed the form of Śiśumāra in the seventh heaven, which is situated in the topmost level of the universe. All the other planets, beginning with the sun, exist under the shelter of this Śiśumāra planetary system.
Thus end the Bhaktivedanta purports of the Fifth Canto, Twenty-second Chapter of Śrīmad-Bhāgavatam, entitled “The Orbits of the Planets.”