उमामहेश्वरव्रतं—पञ्चाक्षरमन्त्रस्य माहात्म्यं, न्यासः, जपविधिः, सदाचारः, विनियोगः
यावद्ग्रहणमोक्षं तु तावन्नद्यां समाहितः जपेत्समुद्रगामिन्यां विमोक्षे ग्रहणस्य तु
yāvadgrahaṇamokṣaṃ tu tāvannadyāṃ samāhitaḥ japetsamudragāminyāṃ vimokṣe grahaṇasya tu
From the onset of the eclipse until its release, one should remain in a river, composed and concentrated, performing mantra-japa. And in a river that flows to the ocean, one should continue the japa until the eclipse is fully released.
Suta Goswami
It prescribes eclipse-time discipline—river-snana with steady mantra-japa—supporting purification and focused devotion to Pati (Shiva), which strengthens Linga-puja as a sadhana.
By emphasizing samāhita japa through a liminal cosmic event (grahaṇa), it points to Shiva as Pati who is approached through inner steadiness and mantra, transcending changing celestial conditions that bind the pashu.
A combined rite of snāna (immersion in a sacred river) and continuous japa with mental collectedness (samāhita), akin to a Pāśupata-oriented discipline of concentration during potent times.