Dvādaśāṃśa (D-12)

Dvādaśāṃśa (द्वादशांश, also written Dwadashamsha or Dwadasamsa) — the D-12 chart — is the eighth of the sixteen classical Ṣoḍaśa-vargas described in Brihat Parāśara Horā Śāstra. The Dvādaśāṃśa reads the pitṛ-mātṛ (parents) register — father and mother specifically, the ancestral-lineage dimension, and the inherited-register of the native's life. The name dvādaśāṃśa is Sanskrit for "twelfth part." The D-12 is the classical primary varga for parent-register assessment alongside the 4th-bhāva (mother) and 9th-bhāva (father) of the Rāśi-chart.

Classical grounding

Brihat Parāśara Horā Śāstra's Ṣoḍaśa-varga-adhyāya names the Dvādaśāṃśa's computational rule and its parent-register signification; Bṛhat Jātaka of Varāhamihira chapter 8 names the same scheme; Phaladeepikā and Saravali extend the treatment. Classical sources name Chandra as mātṛ-kāraka (mother-kāraka) and Sūrya as pitṛ-kāraka (father-kāraka), and their placements in the D-12 are classically cross-referenced with the corresponding Rāśi-chart bhāvas for complete parent-register assessment.

Computational scheme

BPHS's division rule for D-12: each 30° rāśi is divided into twelve 2°30' parts, with the dvādaśāṃśa-count beginning from the same rāśi for all rāśis regardless of parity or element. The twelve dvādaśāṃśas of any rāśi therefore proceed sequentially through all twelve rāśis starting from the rāśi itself. Example: Meṣa's twelve dvādaśāṃśas are Meṣa (0°–2°30'), Vṛṣabha (2°30'–5°), Mithuna (5°–7°30'), Karka (7°30'–10°), Siṃha (10°–12°30'), Kanyā (12°30'–15°), Tulā (15°–17°30'), Vṛścika (17°30'–20°), Dhanu (20°–22°30'), Makara (22°30'–25°), Kumbha (25°–27°30'), Meena (27°30'–30°). Vṛṣabha's twelve begin from Vṛṣabha and run through Mithuna, Karka, Siṃha, and so on. The D-12 scheme is the simplest of the supplementary vargas — uniform start from the rāśi itself, no parity or element distinction.

Classical significations

The Dvādaśāṃśa-chart classically reads pitṛ-mātṛ — parents, the father-mother pair specifically, ancestral-lineage register, and the inherited life-circumstances. Classical reading: the 4th-bhāva of the D-12 chart reads mother specifically; the 9th-bhāva of the D-12 reads father; the Lagna of the D-12 reads the native's ancestral-register orientation. Sūrya and Chandra placements in the D-12 are classically cross-referenced with the corresponding Rāśi-chart readings. The 4th-lord and 9th-lord of the Rāśi placed strongly in the D-12 classically strengthen the parent-register reading.

Classical interpretation register

The classical interpretation register of the Dvādaśāṃśa is pitṛ- mātṛ-specific — the chart specialises the Rāśi-chart's combined 4th-bhāva and 9th-bhāva parent readings. Classical commentators note that the D-12 supplements rather than replaces these primary bhāva-readings and that complete parent-register assessment requires reading the Rāśi 4th-bhāva, 9th-bhāva, their lords, Sūrya and Chandra placements, and the D-12 chart together. Vargottama in the D-12 (same rāśi in D-1 and D-12 — which occurs only in the first 2°30' of any rāśi) is classically a significant strength-register. The D-12 is included in graded-varga schemes from Ṣoḍaśa-varga. The Pitṛ-dośa classical reading cross-references the D-12 (the parent-chart) with the 9th-bhāva, Sūrya, and Rāhu for the full ancestral-register assessment — cross-reference to the Pitṛ-dośa page in the Dosha category is classically direct.

Related Concepts

• Rāśi (D-1) — primary chart
• Sukha-bhāva (4th) — 4th bhāva — mother register
• Dharma-bhāva (9th) — 9th bhāva — father register
• Sūrya — classical pitṛ-kāraka
• Chandra — classical mātṛ-kāraka
• Pitṛ-dośa — ancestral-register dośa