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Ketu Mahadasha: Seven Years, Balance and Subperiods

Learn Ketu mahadasha’s seven-year length, its place before Venus and how a partial birth balance works without predicting loss or withdrawal.

Names and related terms
Ketu Mahadasha

Editorially reviewed: · Reviewed by OpenFate · Editorial Methodology

Overview

Ketu mahadasha is Ketu’s seven-model-year main period in Vimshottari. It follows Mercury and precedes Venus. The full seven years are a schedule parameter; a timeline beginning at birth may show only the remaining fraction.

At a glance

Full duration
7 model years
Previous / next
Mercury / Venus
First antardasha
Ketu/Ketu
Not the same thing
A transit of the descending lunar node

What does a Ketu period actually identify?

The label identifies a ruler and interval in the chosen dasha system, not the node’s present position. Ketu is a calculated lunar node, but the standard starting dasha comes from the natal Moon’s nakshatra rather than from Ketu’s own longitude.

Traditional narratives may use detachment language, yet that cannot establish isolation, loss or an obligation to withdraw. Begin with the actual dates and chart context. A seven-year period is not a command to abandon work, relationships or treatment.

A partial Ketu period is not seven new years

Suppose an invented Moon has one quarter of a Ketu-ruled nakshatra left. The balance is 7 × 1/4 = 1.75 model years. The full Ketu parent began 5.25 model years before birth; its antardashas must be positioned on that full interval.

Ketu/Ketu lasts 7 × 7 / 120 = 49/120 model years at the full parent’s start. It has already ended in this example. Giving the newborn a fresh Ketu/Ketu period would confuse the remaining balance with a new main-period beginning.

What should I check before reading “Ketu then Venus”?

After the full Ketu endpoint, Venus begins its own 20-year parent period under the same cycle. That change of label does not guarantee a difficult phase ends or an easier life begins. Compare actual circumstances without treating a sequence transition as evidence of their cause.

If the birth Moon is uncertain near a nakshatra edge, the balance and even the first ruler may be unresolved. Use the birth-time and current-dasha guides before a personalized interpretation. No remedial purchase or ritual outcome follows from the period arithmetic.

Sources and editorial basis

  1. P. V. R. Narasimha Rao: Vedic Astrology — An Integrated Approach
    Rao, 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.
  2. OpenFate Editorial Methodology
    OpenFate 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.
  3. OpenFate Vedic implementation: local source review, 2026-09-08
    Read-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.
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