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Dwadasamsa Chart Calculator (D12)

The **Dwadasamsa (D12)** divides each zodiac sign into twelve equal parts of 2°30′ each, and is the divisional chart classically consulted for questions about parents, ancestry, and family lineage — a finer complement to the D1 chart’s 4th (mother) and 9th (father) houses.

Ayanamsa: Lahiri (Chitrapaksha) · Division: D12 (twelfth-harmonic) · Rule: count parts from the sign itself

Don't know your birth time? We'll approximate your chart using 6:00 AM local time. The Lagna (Ascendant) and house positions will be approximate.

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James Whitfield

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Sarah Mitchell, M.A. in Cultural Astronomy & Astrology and Marcus Reynolds, Professional Astrologer & Astronomer

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What Is the Dwadasamsa (D12) Chart?

Each 30° sign splits into twelve equal 2°30′ parts, counted forward from the sign itself — the most straightforward of the classical divisional counting rules, producing a chart specifically for parental and ancestral themes.

Reading Parents and Ancestry From the D12

The 4th house of the D12 (mother) and the 9th house (father) are given particular attention, alongside the general condition of the chart’s Lagna, when assessing parental relationships, inherited traits, and family background.

Ancestral and Lineage Themes

Beyond immediate parents, some traditions read the D12 for broader ancestral patterns — what one inherits from family lineage, not just literal parental relationships, treating it as a chart of one’s roots.

Dwadasamsa Chart Calculator (D12) FAQs

What is the Dwadasamsa (D12) chart used for?
Studying parents, ancestry, and family lineage — a finer lens on the D1 chart’s 4th (mother) and 9th (father) houses.
How is the D12 calculated?
Each sign is divided into twelve equal 2°30′ parts, counted forward starting from the sign itself.
Does the D12 replace looking at the D1 4th and 9th houses?
No — it’s read alongside them for a more detailed picture, not as a replacement.
Can the D12 tell me about ancestors beyond my parents?
Some traditions extend it to broader ancestral and lineage themes, though its primary classical use is the immediate parents.
Do I need an accurate birth time?
Yes — like all divisional charts, the D12 Lagna depends on an accurate D1 Lagna.

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