Vimśottarī mahādaśā sequence reference
The nine major-period order, nominal durations, 120-year cycle, and timestamp conventions used to construct a complete Vimśottarī timeline.
Timing reference · released 2026-08-18
Event definition
A mahādaśā is a major interval in the fixed nine-lord Vimśottarī cycle. The conventional allocations total 120 nominal years before the sequence repeats.
Reproducible calculation
Start from the birth-balance anchor, advance through Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, and Mercury cyclically, and add each lord’s declared nominal duration using one frozen year-length convention.
Required inputs
- Birth-balance anchor
- Starting lord
- Nine-lord order and durations
- Nominal year length
- UTC serialization policy
Maha convention
Maha uses 365.2425 days per nominal year and half-open UTC intervals: a period is active at its start and inactive at its end. The final boundary of one period is exactly the first boundary of the next.
Uncertainty and edge cases
Different year lengths, balance methods, ayanāṁśas, or timestamp rounding policies accumulate disagreement across decades. Comparing software requires isolating these choices rather than comparing only the displayed lord.
How reports may use this reference
Reports may show the complete major-period chronology and active interval. They do not assign a generic meaning to a major period without a reviewed, source-bound interpretation rule.
What this does not establish
The mahādaśā sequence does not establish a causal timeline or demonstrate predictive skill merely because its dates are deterministic.
Calculation and convention sources
Sources establish astronomical states or a declared chronology convention. They do not establish predictive meaning.
- Vimśottarī daśā calculation convention
Bṛhat Parāśara Horā Śāstra tradition · Calculation locator: chapters 46 and 51; passage review pending
The conventional nine-lord order, 120-year duration, natal balance concept, and proportional sub-period structure used by the implementation.
Boundary: Translation provenance and excerpt rights have not passed Maha’s passage registry. The source is used as a calculation locator only; no passage or prediction is republished.