Matsya Purana — Dhruva as Cosmic Pivot: Motions of Sun–Moon–Planets
गायत्री चैव त्रिष्टुप्च जगत्यनुष्टुप्तथैव च पङ्क्तिश्च बृहती चैव उष्णिगेव तु सप्तमम् //
gāyatrī caiva triṣṭupca jagatyanuṣṭuptathaiva ca paṅktiśca bṛhatī caiva uṣṇigeva tu saptamam //
(The metres are:) Gāyatrī, Triṣṭubh, Jagatī, and likewise Anuṣṭubh; also Paṅkti and Bṛhatī—these, with Uṣṇik as the seventh.
This verse does not describe Pralaya directly; it catalogs key Vedic metres (chandas), implying that correct mantra-metrics remain foundational even across changing cosmic cycles in Purāṇic ritual culture.
By naming standard chandas used in sacred recitation, the verse supports dharmic duties—kings and householders uphold yajña, japa, and scriptural learning, where correct metre preserves the integrity and efficacy of mantras.
The ritual significance is primary: it lists seven important metres used to structure mantra recitation. While not architectural, such chandas knowledge commonly underpins temple-ritual chanting and liturgical correctness in Puranic practice.