सूर्यरथ-कालचक्र-आयनविभागः, संध्योपासनम्, देवयान-पितृयानम्, विष्णुपद-गङ्गावतरणम्
तस्माद् दीर्घेण कालेन भूमिम् अल्पां तु गच्छति अष्टादशमुहूर्तं यद् उत्तरायणपश्चिमम्
tasmād dīrgheṇa kālena bhūmim alpāṃ tu gacchati aṣṭādaśamuhūrtaṃ yad uttarāyaṇapaścimam
Therefore, over a long span of time it traverses only a small portion of the earth; and that westward course during the Sun’s northward progress (uttarāyaṇa) is reckoned as eighteen muhūrtas.
Sage Parāśara (teaching Maitreya)
Cosmic Hierarchy: Lokas
Concept: Time is quantified through the Sun’s measured course, where even a small terrestrial traverse corresponds to a defined temporal unit (muhūrta) in uttarāyaṇa.
Vedantic Theme: Dharma
Application: Use sacred time-units (muhūrta/ayana) to cultivate disciplined daily rhythm and seasonal awareness in sādhana.
Vishishtadvaita: Cosmic order (ṛta/dharma) is intelligible and stable because it is sustained by the Lord’s governance of time and motion.
In this passage, uttarāyaṇa marks a specific phase of the Sun’s course used to explain how celestial motion is measured in terrestrial time-units (muhūrtas), showing cosmic order as a structured, knowable rhythm.
Parāśara links observed directional movement (a western course during uttarāyaṇa) with a quantified duration—eighteen muhūrtas—illustrating Purāṇic timekeeping through celestial cycles.
Even when describing astronomy and time, the Vishnu Purana frames the universe as an ordered system sustained by the Supreme Reality—Vishnu—whose sovereignty is reflected in the dependable regularity of cosmic cycles.