Matsya Purana — Soma
अनुमतिश्च राका च सिनीवाली कुहूस्तथा एतासां द्विलवः कालः कुहूमात्रा कुहूः स्मृता //
anumatiśca rākā ca sinīvālī kuhūstathā etāsāṃ dvilavaḥ kālaḥ kuhūmātrā kuhūḥ smṛtā //
Anumati, Rākā, Sinīvālī, and Kuhū—these lunar phases are thus described. The time-span connected with them is two lavas; and Kuhū is traditionally reckoned as the measure called “kuhū-mātrā”.
This verse is not about pralaya; it defines lunar phases (Anumati, Rākā, Sinīvālī, Kuhū) and links them to precise time-measures, showing the Purāṇic emphasis on cosmic order through calendrical reckoning.
By specifying lunar phases and their time-measures, it supports correct scheduling of vratas, śrāddha, dāna, and public rites—duties central to both householders and kings who uphold dharma through properly timed rituals.
The significance is primarily ritual: correct identification of amāvāsyā/pūrṇimā-related phases (Kuhū, Rākā, etc.) and their timing helps determine auspicious/required windows for yajña, vrata observances, consecrations, and other saṃskāras.