Mars period in the Vimśottarī chronology
The calculation role of Mars in the nine-lord Vimśottarī sequence, including its 7-year nominal mahādaśā duration and proportional sub-period timing.
Timing reference · released 2026-08-18
Event definition
Mars is one member of the fixed Vimśottarī order Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, and Mercury. Its nominal mahādaśā allocation is 7 years within the conventional 120-year cycle.
Reproducible calculation
Locate Mars in the fixed sequence. For a Mars mahādaśā, convert 7 nominal years using the declared year-length convention. For a Mars antardaśā inside any parent period, multiply the parent duration by 7/120 and preserve the parent lord, timestamps, and rounding policy.
Required inputs
- Natal Moon Lahiri-sidereal nakṣatra and elapsed fraction
- Fixed nine-lord sequence
- Mars duration weight of 7/120
- Declared year length and timestamp rounding
Maha convention
Maha uses 365.2425 days per nominal year, computes the birth balance from the Moon’s solved ingress-to-egress time fraction, and stores UTC boundaries. The Mars label identifies a position in that chronology, not a generated interpretation.
Uncertainty and edge cases
Birth-time uncertainty, ayanāṁśa choice, Moon ephemeris, nakṣatra-boundary proximity, year length, and rounding can alter period boundaries. A natal Moon near a nakṣatra edge can also change the starting lord entirely.
How reports may use this reference
A report may state when the calculated Mars period starts and ends, its level, parent period, nominal duration, and method. Interpretive statements require source-bound daśā rules and practitioner review; none are inferred from the lord name here.
What this does not establish
A Mars period does not establish that a particular event, personality state, financial result, relationship change, or business outcome will occur.
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.
- Astronomy Engine
Don Cross (cosinekitty) · 2.1.19
Locally computed planetary longitudes, moon phases, eclipses, and search primitives used by Maha’s deterministic calculation layer.
Boundary: Library output is a computed astronomical result. Its reproducibility does not validate a symbolic or predictive meaning.