Matsya Purana — Planetary Chariots
स्वर्भानोस्तु यथाष्टाश्वाः कृष्णा वै वातरंहसः रथं तमोमयं तस्य वहन्ति स्म सुदंशिताः //
svarbhānostu yathāṣṭāśvāḥ kṛṣṇā vai vātaraṃhasaḥ rathaṃ tamomayaṃ tasya vahanti sma sudaṃśitāḥ //
For Svarbhānu (Rāhu), there are eight black horses, swift as the wind; well-harnessed, they draw his chariot, which is made of darkness.
Directly, it does not describe Pralaya; it uses cosmic imagery to characterize Rāhu as a being associated with darkness, reinforcing the Purāṇic symbolic mapping of darkness and obstruction in the heavens.
Indirectly, it functions as moral-cosmic instruction: just as celestial forces can ‘eclipse’ light, a king or householder must restrain disruptive impulses (tamas) through discipline and right order—an ethical theme that the Matsya Purana frequently applies to governance and conduct.
No explicit Vāstu or ritual rule is stated; however, the verse’s chariot-and-horses iconography is useful for pratīmā-lakṣaṇa (iconographic visualization) when depicting grahas like Rāhu in temple art or ritual diagrams.