Panchanga in the pre-Paninian era

NOTE: LLM has been used to investigate Ṡaunaka’s Ṛg-vidhāna

Rig Vidhana of Shaunaka is a bridge between the Vedic era and Puranic era. M.S.Bhat in his book on “Vedic Tantrism” analyses the linguistic style and concludes it to be pre-Paninian (i.e. before 400 BCE). Ṛg-vidhāna is mostly a pro-Vaiṣṇava text, especially chapter 3. It contains the famous “jitante stotram” appropriated by Pancharatra literature in later centuries (e.g. Ishvara samhita). Another popular verse recited during daily sandhyā ritual:

dhyēyaḥ sadā savitṛ-maṇḍala-madhya-vartī
nārāyaṇaḥ sarasijāsana-samniviṣṭaḥ
kēyūravān makara-kuṇḍalavān kirīṭī
hārī hiraṇmaya-vapur dhṛta-ṡaṅkha-cakraḥ (ṚgVidh 3.224)

These are likely later additions, as concluded by M.S.Bhat:

“The last passage (stanzas 134-230) on the Puruṣasūkta-vidhāna is entirely due to Viṣṇukumāra. The Tantric and Yogic elements, which it contains, are possibly added during the ninth century A.D. or even later.”

Our focus in this article is not on the Vaishnava layer in the text. But on the Hindu calendar.

Here are all the calendrical (pañcāṅga) features visible in the text:

1. Tithi (lunar day)

The nyāsa section (RVdh. 3.155-160) also uses tithi numerals (prathamā through ṣoḍaṡī) to number the 16 Puruṣa Sūkta verses mapped to body parts — a calendrical borrowing.

2. Pakṣa (fortnight)

3. Māsa (lunar month) — the full list of 12

RVdh. 3.139–141 gives the classical 12 months with their Viṣṇu-name:

This might’ve been the earliest attestation of the 12-month + 12-name system in a Vedic text, though M.S.Bhat rightly points out the late additions.

4. Rāhu-Sūrya samāgama (eclipse)

RVdh. 2.31–32 — rāhu-sūrya samāgame — “at the conjunction of Rāhu and the Sun” (a solar eclipse). Prescribed for a 1000-fold homa for wealth. Eclipses are treated as especially potent ritual moments.

5. Nakṣatra (asterisms)

RVdh. 3.134: su-nakṣatre — “in an auspicious asterism” (general, not named).

RVdh. 4.106 — specific asterisms for royal consecration:

tiṣyeṇa ṡravaṇena vā | pauṣṇa-sāvitra-saumya-aṡvi-rohiṇīṣu uttarāsu ca

“by Tiṣya (Puṣya), Ṡravaṇa, or in Pauṣṇa, Sāvitra, Saumya, Aṡvinī, Rohiṇī, or the Uttarā asterisms”

This lists 8+ specific nakṣatras for abhiṣeka — the earliest Vedic vidhāna to do so.

Both of these occurences are likely interpolated.

6. Parva (transitional / nodal days)

Mentioned repeatedly as ritually significant:

• RVdh. 1.98: parvasu — at parva days
• RVdh. 2.21: parvasu prayataḥ — devotions at parvas
• RVdh. 2.143: etat parva ṡatam kṛtvā — performing 100 parvas = 100 years of life
• RVdh. 3.34: pakṣayoḥ — at the two fortnight boundaries
• RVdh. 3.76: anayā parvasu snātvā — bathing at parvas

Parva here likely refers to the four quarterly phases on the moon (new moon day, full moon day, aṣtamī days on two pakṣas), especially the full- and new-moon days – the classic Vedic parvan days.

7. Ṛtu (season)

RVdh. 3.43: ṛtu-kāle — “at the proper season” (for conception/garbhādhāna). The text does not enumerate the six seasons but this sole occurence refers to women’s monthly cycle.

8. Saṃvatsara (year)

• RVdh. 3.39: parisaṃvatsaram — for a full year
• RVdh. 4.135: pratisaṃvatsaram — yearly performance of Vāstu-ṡamana
• RVdh. 4.142: asaṃvatsara uṣitāya — the text should not be taught to one who has not stayed a full year
• RVdh. 4.25: saṃvatsare tṛtīye — in the third year of a ritual cycle

9. Times of day

The text distinguishes:

• prātaḥ (morning)
• madhyaṃdina (noon)
• sāyaṃ (evening)
• saṃdhyā-kāla (twilight) — RVdh. 1.62
• ardha-rātra (midnight) — for yoga practice, RVdh. 3.193
• triṣavaṇam (three bath-times) — RVdh. 1.40

10. What is not present

• No weekdays (vāra): no Ravivāra, Somavāra, etc. The vāra system was not yet standard in this text’s milieu.
• No saṅkrānti (solar ingress)
• No Yoga or Karaṇa (the two other “limbs” of the classical pañcāṅga alongside tithi, nakṣatra, vāra)
• The word tithi itself does not appear — only the ordinal numbers
• No planetary hours, no muhūrta selection beyond general auspiciousness

Summary

The calendrical framework is luni-solar with a clear hierarchy:

1. Lunar: tithi (esp. dvādaṡī, caturdaṡī, ekādaṡī), pakṣa (ṡukla/kṛṣṇa), māsa (12 named), parva (new/full moon)
2. Sidereal: nakṣatra (at least 8 named for king’s abhiṣeka)
3. Astronomical event: eclipse (Rāhu-Sūrya)
4. Solar: visible only indirectly through season (ṛtu) and year (saṃvatsara)
5. Daily: 5-part division of day (dawn, morning, noon, evening, midnight)

The system is pre-classical — it has the building blocks of pañcāṅga (tithi, nakṣatra, māsa, parva) but lacks the full 5-limb structure, weekday names, and the sophisticated saṅkrānti/muhūrta apparatus of later Jyotiṣa. The Vedāṅga Jyotiṣa’s year-measurement is assumed but not discussed.

Interpolations

Bhat identifies several strata of later additions and interpolations:

Adhyāya 1:

• Sts. 27–56 (penances from Manusmṛti) — later addition, interrupts continuity
• Sts. 72–78 (Gāyatrī efficacy) — suspicious, topic handled later anyway
• Sts. 9, 58, 87 — smaller additions

Adhyāya 2:

• Sts. 25–62 (Gāyatrīmantravidhāna) — heavily tampered with, replete with repetitions
• Sts. 149–152 (release from Bhūmipāṡa, sins with forbidden women) — probable additions

Adhyāya 3:

• More than half of this adhyāya is later additions
• Sts. 21–33 (Brahmahatyā expiation) — from Smṛti
• Sts. 79–114 (Hṛdyasūkta) — “exceedingly suspicious,” reminiscent of Tantric practices unknown in Vedic literature
• Sts. 134–230 (Puruṣasūktavidhāna) — entirely by one Viṣṇukumāra; added 9^th c. CE or later; existed separately before incorporation
• Sts. 149–152 (release from Bhūmipāṡa, sins with forbidden women) — probable additions

Adhyāya 3:

• More than half of this adhyāya is later additions
• Sts. 21–33 (Brahmahatyā expiation) — from Smṛti
• Sts. 79–114 (Hṛdyasūkta) — “exceedingly suspicious,” reminiscent of Tantric practices unknown in Vedic literature
• Sts. 134–230 (Puruṣasūktavidhāna) — entirely by one Viṣṇukumāra; added 9^th c. CE or later; existed separately before incorporation

Adhyāya 4:

• Sts. 106–114 (coronation/royal rites) — suspicious, unrelated to context

Phalaṡruti (Vargas 1–3) — apocryphal; omitted from the total verse count

Overall: about half the text is authentic/core material; the Smṛti-material was interpolated during the early centuries CE, and the Puruṣasūkta section with its Tāntric and Yogic elements was added during or after the 9^th century CE