Bhagavatapurana 3.21.18

3.21.18

na te 'jarākṣa-bhramir āyur eṣāṃ trayodaśāraṃ tri-śataṃ ṣaṣṭi-parva /
ṣaṇ-nemy ananta-cchadi yat tri-ṇābhi karāla-sroto jagad ācchidya dhāvat //

18. The cycle of Time resting on three supports is not powerful enough to deprive them of their life while it passes on, as it does in the case of the rest of the world—the cycle of time which rotates round the axis of the imperishable Brahman, which has thirteen spokes (the thirteen months including the Adhikamasa), and which has three hundred and sixty joints (the days in the year), the six seasons for its tires, innumerable parts (leaf-like carvings all round), and three supports *viz.*, the three periods each consisting of four months.