Graha–Ketu–Utpāta Lakṣaṇas: Solar/Lunar Omens, Comets, Eclipses, and Calendar Rules
षण्मासवृद्ध्या ग्रहणं शोधयेद्र विचंद्र योः । पर्वेशास्तु तथा सत्यदेवा रव्यादितः क्रमात् ॥ ८१ ॥
ṣaṇmāsavṛddhyā grahaṇaṃ śodhayedra vicaṃdra yoḥ | parveśāstu tathā satyadevā ravyāditaḥ kramāt || 81 ||
以增补六个月的校正,应当推算并核验日食与月食。同样,诸“帕尔梵日”(交会日)的主宰也应依次判定——从太阳开始——并连同相应的“萨提亚天神”(Satya-deva)一并确立。
Sanatkumara (in instruction to Narada within the Moksha-Dharma discourse, touching Vedanga-style calendrical science)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It links dharma to correct time-reckoning: sacred observances depend on accurate parvan and eclipse determination, so spiritual practice is aligned with cosmic order (ṛta).
Indirectly: bhakti-oriented vratas and worship performed on parvan days or during eclipse-related rites require proper calendrical knowledge; devotion is strengthened when worship is done at the right sacred times.
Vedāṅga Jyotiṣa: the verse indicates a rule of correction (six-month adjustment) for checking solar/lunar eclipses and determining parvan presiding deities in proper sequence.