What are the primary astronomical and shastric parameters of Ardra Nakshatra (066° 40' to 080° 00') — 4 Padas, Deity, Navamsa D9 & Shastra Concordance?

Sanskrit Name: Ārdrā (Bāhu); Sidereal Arc: 066° 40' to 080° 00'; Rashi Span: 06° 40' to 20° 00' Mithuna (The Twins); Vimshottari Lord: Rahu (18 Years); Vedic Deity: Rudra (Lord of the Cleansing Storm). Verified against NASA JPL DE441 ephemeris (Chitrapaksha Lahiri Ayanamsha) and the 18-treatise Sanskrit corpus.

01 · SIDEREAL LUNAR MANSION (NAKSHATRA 06 OF 28)

06. Ardra (Ārdrā (Bāhu)) — 066° 40' to 080° 00'

Q: What is the canonical definition of Ardra Nakshatra (066° 40' to 080° 00') — 4 Padas, Deity, Navamsa D9 & Shastra Concordance (NAKSH-01) in sidereal Jyotish?

Ardra is governed in the Vimshottari Dasha cycle by Rahu (18 Years) and presided over by the Vedic deity Rudra (Lord of the Cleansing Storm). Its astronomical junction star (Yoga Tara) is identified with Alpha Orionis (Betelgeuse), and its inherent power is Yatna Shakti (power of concentrated effort and breakthrough).

In classical Sanskrit positional astronomy, Ardra (Ārdrā (Bāhu)) is the 6-numbered lunar mansion spanning 06° 40' to 20° 00' Mithuna (The Twins) (066° 40' to 080° 00' of the sidereal ecliptic). Within the vectorized corpus (jyotish_corpus_core_v3), Ardra is directly indexed across 166 verified passages and 95 numbered shlokas in 12 Sanskrit treatises.

Canonical Definition · Ardra (066° 40' to 080° 00')

Ardra is governed in the Vimshottari Dasha cycle by Rahu (18 Years) and presided over by the Vedic deity Rudra (Lord of the Cleansing Storm). Its astronomical junction star (Yoga Tara) is identified with Alpha Orionis (Betelgeuse), and its inherent power is Yatna Shakti (power of concentrated effort and breakthrough).

13° 20' SIDEREAL LUNAR MANSION & 4-PADA NAVAMSA (D9) PROJECTION Nakshatra 06 (Ardra)

SIDEREAL ARC: 066° 40' to 080° 00' | RASHI: MITHUNA | DASHA LORD: RAHU (18 YEARS) 0° Mesha 180° Chitra (Spica) 360° Revati 4 EQUAL NAVAMSA PADAS (3° 20' = 200 ARC-MINUTES EACH) Pada 1 · "Ku" Dhanu (Sagittarius D9) Lord: Guru Pada 2 · "Gha" Makara (Capricorn D9) Lord: Shani Pada 3 · "Nga" Kumbha (Aquarius D9) Lord: Shani Pada 4 · "Chha" Meena (Pisces D9) Lord: Guru Deity: Rudra (Lord of the Cleansing Storm) | Gana: Manushya (Human)

02 · FOUR PADAS & NAVAMSA (D9) HARMONIC MAPPING

The Four 3° 20' Padas of Ardra & Ninth-Harmonic Dispositors

The lunar mansion Ardra divides into four equal quarters (Padas) of 3° 20' (200 arc-minutes each) that project directly into the Navamsa (D9) harmonic chart. In Ardra, this four-fold partition links the sidereal longitude in Mithuna to four consecutive Navamsa signs and phonetic seed syllables (Aksharas).

According to Brihat Samhita Chapter 98 Verse 8 and Chapter 101 Verse 6 and Brihat Parashara Hora Shastra Chapter 46 Verses 32 to 35, Ardra carries a tikshna and daruna (sharp and dreadful) temperament and a manushya (human) classification. Within the ecliptic structure of Ardra, Pada 4 (16°40'–20°00' Mithuna) is a Pushkara Navamsa in Meena (D9).

Pada & Degree Span	Navamsa (`D9`) Sign	`D9` Ruler & Syllable	Classical Pada Delineation
`Pada 1 (06°40' – 10°00' Mithuna)`	`Dhanu (Sagittarius D9)`	Guru (`"Ku"`)	Philosophical quarter directing Ardra investigative intensity toward philosophical truth and inquiry.
`Pada 2 (10°00' – 13°20' Mithuna)`	`Makara (Capricorn D9)`	Shani (`"Gha"`)	Structural quarter anchoring Ardra storm energy in rigorous engineering and material perseverance.
`Pada 3 (13°20' – 16°40' Mithuna)`	`Kumbha (Aquarius D9)`	Shani (`"Nga"`)	Scientific air-to-air quarter excelling in mathematical computation, acoustics, and systemic reform in Ardra.
`Pada 4 (16°40' – 20°00' Mithuna)`	`Meena (Pisces D9)`	Guru (`"Chha"`)	Pushkara Navamsa quarter transforming Ardra catharsis into compassionate healing and spiritual insight.

03 · MULTI-TREATISE SHASTRA CONCORDANCE

Citations for Ardra Across 18 Classical Sanskrit Shastras

The concordance table below details how Ardra is distributed across the eighteen classical treatises of jyotish_corpus_core_v3. Varahamihira in Brihat Samhita and Brihat Jataka defines the stellar coordinates, seasonal transits, and natal Moon traits of Ardra, while Muhurta Chintamani and Kalaprakashika codify electional Panchanga rules for Ardra.

Sanskrit Treatise	Verified Passages	Chapter Coverage	Analytical Scope
Muhurta Chintamani	`64 passages`	`7 ch / 23 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 7 chapters.
Brihat Samhita	`51 passages`	`21 ch / 44 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 21 chapters.
Brihat Jataka	`11 passages`	`6 ch / 3 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 6 chapters.
Surya Siddhanta	`11 passages`	`4 ch / 7 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 4 chapters.
Ashtakavarga Grantha	`9 passages`	`7 ch / 5 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 7 chapters.
Brihat Parashara Hora Shastra	`6 passages`	`3 ch / 5 v`	Records lunar transit rules, Tara Bala compatibility, and janma nakshatra results for Ardra across 3 chapters.

04 · VERBATIM CORPUS FOLIO & VIMSHOTTARI SYNCHRONY

Archival Public-Domain Folio Excerpt for Ardra

This archival passage for Ardra comes from the public-domain edition of Brihat Parashara Hora Shastra (Chapter 3, Verse 7) in jyotish_corpus_core_v3. When the natal Moon or Lagna occupies Ardra, the remaining arc of Ardra determines the opening balance of the Rahu Mahadasha (18 Years).

CORPUS PROVENANCE: Brihat Parashara Hora Shastra | Source ID: archive_brihat-parashara-hora-sastra | Chapter 3, Verse 7
"Lagn and the Grahas, joining and departing from each other, the native s good and bad effects are deducted Addition from Santhanam till Sloka 7 The names of the 27 Nakshatras are Ashvini, Bharani, Krittika, Rohini, Mrigasira, Ardra, Punarvasu, Pushya, Aslesha, Magha, Purvaphalguni, Uttaraphalguni, Hasta, Chitra, Swati, Vishaka, Anuradha, Jyeshtha, Mula, Purvashadh,"

In Ashtakoota synastry and daily Gochara transit analysis, Ardra is the reference anchor for computing the nine-fold Tara Bala cycle (Janma, Sampat, Vipat, Kshema, Pratyak, Sadhana, Naidhana, Mitra, and Parama Mitra) and checking Nadi and Gana compatibility (Manushya (Human)).

✦︎ SUTRA BLACK LABEL · INDIVIDUAL EPHEMERIS SYNTHESIS

Calculate Exact Ardra Pada & Dasha Balances for Birth Coordinates

This encyclopedia entry documents the astronomical and shastric parameters of Ardra (066° 40' to 080° 00'). To compute exact birth-second planetary placements in Ardra, five-tier Vimshottari Dasha dates, and Navamsa (D9) dignities under DE441 Lahiri precession, visit jyotish.vip.

Ardra 4-Pada Precision
DE441 Ephemeris (0.001°)
Rahu Dasha Balance
Verbatim Shloka Citations

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Sanskrit Name	`Ārdrā (Bāhu)`
Sidereal Arc	`066° 40' to 080° 00'`
Rashi Span	06° 40' to 20° 00' Mithuna (The Twins)
Vimshottari Lord	Rahu (18 Years)
Vedic Deity	`Rudra (Lord of the Cleansing Storm)`
Yoga Tara Star	`Alpha Orionis (Betelgeuse)`
Traditional Symbol	`Teardrop or Cut Diamond`
Gana & Temperament	`Manushya (Human) · Tikshna and Daruna (Sharp and Dreadful)`
Guna & Tattva	`Tamas · Jala (Water)`
Corpus Passages	`166 (95 v)`
Observatory	jyotish.vip