Jyotiṣa-śāstra Saṅgraha: Threefold Division, Gaṇita Methods, Muhūrta, and Planetary Reckoning
विश्वघ्नलंबनकलाढ्योनस्तु तिथिवद्यगुः । शरोनोलंबनषडघ्ने तल्लवाढ्योनवित्रिभात् ॥ १६१ ॥
viśvaghnalaṃbanakalāḍhyonastu tithivadyaguḥ | śaronolaṃbanaṣaḍaghne tallavāḍhyonavitribhāt || 161 ||
إذا زِيد الباقي بـ«كلا» (الدقيقة) وضُبط بـ«لمبنة» (مقدار التصحيح) نتجت «تيثي» (tithi). وإذا عولِج ذلك الباقي بـ«شد-أغنا» (المضاعِف السداسي)، ثم صُحِّح باللمبنة وزِيد عليه «لافا» الموافق، لم يَحِدْ الناتج عن «تري-بهاگا» (القسمة الثلاثية) الصحيحة.
Narada (teaching in a technical/ritual-calendar context to the Sanatkumara tradition)
Vrata: none
Primary Rasa: shanta
Secondary Rasa: adbhuta
It emphasizes that dharma-based observances depend on correct sacred time (kāla); accurate tithi computation safeguards the purity of vrata, pūjā, and meritorious acts.
By ensuring the correct tithi and subdivisions of time, a devotee performs worship and vows at their proper moments, aligning bhakti-practice with scriptural timing (śāstra-kāla).
Jyotiṣa Vedāṅga: it references computational steps using units like kalā and lava and corrections like laṃbana to determine tithi accurately for ritual scheduling.