कालनिर्णयः (युग-मन्वन्तर-कल्पप्रमाणम्) — Measures of Time and Cosmic Cycles
संध्यासंध्यांशयोर् अन्तर् यः कालो मुनिसत्तम युगाख्यः स तु विज्ञेयः कृतत्रेतादिसंज्ञितः
saṃdhyāsaṃdhyāṃśayor antar yaḥ kālo munisattama yugākhyaḥ sa tu vijñeyaḥ kṛtatretādisaṃjñitaḥ
O best of sages, the span of time that lies between the Sandhyā and the Sandhyāṃśa is known as a yuga; it bears the names Kṛta, Tretā, and the other ages.
Sage Parāśara (teaching Maitreya)
Speaker: Parasara
Topic: What portion is properly called a yuga between sandhyā and sandhyāṃśa
Teaching: Cosmological
Quality: authoritative
Creation Stage: Kalpa
Yuga: Satya/Treta/Dvapara/Kali
Concept: The yuga proper is the interval between sandhyā and sandhyāṃśa, and the named ages proceed as an ordered sovereignty under the Supreme Lord Viṣṇu.
Vedantic Theme: Brahman
Application: Anchor one’s sense of historical change in devotion to the Lord as the steady ruler of time, reducing anxiety about societal decline.
Vishishtadvaita: Viṣṇu is the inner ruler of cosmic order (niyantṛ) while the world and time remain real modes (prakāra) dependent on Him.
Vishnu Form: Narayana (cosmic)
This verse frames a yuga in relation to transitional “junction” periods (sandhyā and its portion), indicating that cosmic ages are measured with attention to their boundary-phases, not only their main duration.
Parāśara defines yuga as a specific measurable time-span connected to sandhyā and sandhyā-aṃśa, and identifies that yuga as taking the conventional names Kṛta, Tretā, and the remaining ages.
Although the verse is technical, the Vishnu Purana’s time-structure ultimately serves its theology: the ordered flow of ages and their names is part of the Supreme Lord Viṣṇu’s governance of cosmic law and rhythm.