Mars Mahadasha: Seven Years and the Rahu Subperiod
Learn Mars mahadasha’s position in the cycle, compare its seven years with Ketu, and calculate Mars/Rahu without predicting conflict or injury.
Overview
Mars mahadasha lasts seven model years in Vimshottari, between Moon and Rahu. Although Ketu has the same full duration, the two main periods start at different positions in the ruler cycle and contain differently ordered subperiods.
At a glance
- Full duration
- 7 model years
- Previous / next
- Moon / Rahu
- First antardasha
- Mars/Mars
- Mars/Rahu length
- 21/20 = 1.05 model years
Why are Mars and Ketu not interchangeable?
Both rulers receive seven of the cycle’s 120 model years. Mars antardashas begin Mars, Rahu, Jupiter; Ketu antardashas begin Ketu, Venus, Sun. Equal parent lengths do not produce the same labels at the same elapsed offset.
Mars symbolism is often expressed through action or assertion, but it cannot establish aggression, an accident or bodily harm. A calculated main period is not evidence that a person is dangerous or that an ordinary disagreement will escalate.
Check the second Mars subperiod
Mars/Mars first lasts 7 × 7 / 120 = 49/120 model years. Mars/Rahu then lasts 7 × 18 / 120 = 21/20 years. Its end is 49/120 + 126/120 = 175/120, or 35/24 model years after the full parent start.
A target at elapsed 1 model year lies inside Mars/Rahu. The same offset in Ketu mahadasha belongs to a different subperiod because Venus, not Rahu, follows the initial self-period. Preserve the cycle order rather than copying a table solely because both parents last seven years.
What belongs in a responsible period reading?
State the full interval, remaining balance if relevant, and actual chart context before interpreting a theme. A person’s projects and conflicts need direct evidence; do not offer a favorable or dangerous verdict from Mars alone. Avoid remedial promises based on fear.
An uncertain birth time can shift the calculated start and target subperiod. Check the input interval and year definition with the timing-calculation guide. At an unresolved boundary, retain the alternatives rather than selecting the interpretation with the strongest language.
Sources and editorial basis
- P. V. R. Narasimha Rao: Vedic Astrology — An Integrated ApproachRao, Vedic Astrology: An Integrated Approach. §16.2 / Table 38, pp. 210–211: nine ruler lengths, cyclic order and birth balance; §16.3, p. 212: antardasha ordering and proportional lengths. The page’s fractional offsets are original teaching arithmetic, not observed period dates. Transit comparisons distinguish calculation categories and do not reproduce a transit-prediction method. These passages document named traditional methods, not scientific validity. Examples are synthetic, not verified birth observations.A named practitioner’s introduction to Jyotish. Used for terminology and a stated method, not universal school agreement or scientific validation. The added March 18, 2010 note describes changed views; it does not establish a fully revised 2010 edition.
- OpenFate Editorial MethodologyOpenFate Editorial Methodology, stable sections #editorial-principles, #editorial-workflow, #editorial-ai, and #editorial-context. Used for the calculation/interpretation and evidence-boundary policy.OpenFate separates deterministic chart calculation, traditional interpretation, and modern editorial explanation.
- OpenFate Vedic implementation: local source review, 2026-09-08Read-only source review on 2026-09-08: openfate/app/modules/vedic/logic/policy.ts, VEDIC_ENGINE_POLICY (vedic-policy-1.1.0): Vimshottari only and 365.25-day years; math.ts, horaSign and computeVargaSigns: named D2 Sun/Leo and Moon/Cancer mapping plus D6/D9/D10/D24. This verifies the local declared implementation, not current production or alternate-method UI support.An editorial review of local policy and calculation source files, not an independently accessible publication or proof of the deployed version. Implementation limitations and discrepancies remain separate from traditional arithmetic.