Dasha Overlap in Compatibility: Compare Two Timelines
Compare independently calculated dasha intervals, find their overlap and preserve year-length settings. Shared periods are not marriage predictions.
Overview
Dasha overlap means that two independently calculated period intervals cover some of the same dates. The intersection is a timing fact under declared settings, not evidence that the people are compatible.
At a glance
- Inputs
- Two separately calculated period schedules
- Operation
- Later start to earlier end
- Required convention
- Dasha method and year length
- Not implied
- Meeting, marriage or relationship success
Calculate each schedule before comparing dates
For the Moon-based Vimsottari convention described in Rao §16.2, the first period and remaining balance depend on the birth Moon’s nakshatra and progress through it. Each person therefore needs a separate input record and calculation.
The source explicitly discusses different meanings of a dasha year. Preserve the chosen year length, starting convention and period level; an MD/AD comparison is not interchangeable with two MD labels lacking dates.
A six-month intersection
Use supplied teaching intervals, not calculated birth charts: A runs from 1 January 2030 to 1 January 2032, and B from 1 July 2031 to 1 January 2033. With end dates treated as exclusive, the shared interval is 1 July 2031 to 1 January 2032.
That is six calendar months. It does not identify a wedding date, and the two period lords need not even be the same. If the later start were after the earlier end, there would be no overlap to interpret.
Do not turn simultaneity into relationship evidence
Many unrelated people share broad period windows. A temporal intersection alone says nothing about whether two people will meet, agree or remain together. Any traditional narrative about the intersection is separate from the interval arithmetic.
Keep known dates and uncertain boundaries visible, especially after a birth-data correction. The source supports a timing framework, not a validated compatibility probability or permission to schedule another person’s life around a chart.
Sources and editorial basis
- P. V. R. Narasimha Rao: Vedic Astrology — An Integrated ApproachRao, §§16.1–16.3, printed pp.209–212: Moon-based Vimsottari start, remaining fraction, independent schedules and explicit year-length controversy. Calendar intervals are supplied hypothetical values; overlap is original interval arithmetic, not a source prediction or live birth-chart calculation. Traditional definitions are not scientific validation of personal outcomes.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.