Mudda Dasha

What is Mudda dasha?

Mudda dasha is the Vimshottari dasha compressed into one Tajika year. It uses the same nine lords in the same order — but where natal Vimshottari spreads 120 years across a life, Mudda runs the entire cycle between one Varsha Pravesh (solar-return moment) and the next. It is the timing layer of Varshaphala: it tells you when, within the year, each influence peaks.

The proportions: each lord’s years ÷ 120

Every lord keeps its Vimshottari period length, but as a fraction of the year rather than of 120 years:

The nine sum to 120 years, so the nine periods sum to the whole year. The order is the standard Vimshottari cycle: Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, then wrapping back to Ketu.

AstroShruti measures the year as the actual span to the next Varsha Pravesh rather than a nominal 365.25 days, so the final sub-period lands exactly on the next solar return rather than drifting off it.

The seed lord: advance one place per year

Mudda does not start every year from Ketu. The starting lord is found like this:

1. Take the janma nakshatra — the nakshatra the natal Moon occupied at birth — and its Vimshottari lord.
2. Advance that lord one position along the nine-lord cycle for each completed year of age.

So the seed lord for a given year is cycle[(index of janma lord + age) mod 9]. Two things are easy to get wrong, and AstroShruti gets both right:

• It is the janma (birth) nakshatra lord, not the solar-return Moon’s nakshatra lord.
• It advances by position in the cycle, not by stepping a planet index — the cycle order (Ketu, Venus, Sun, …) is what moves forward.

Seed-lord walk-through

Say the natal Moon is in Rohini, whose lord is the Moon. In the cycle the Moon sits at position 3 (Ketu 0, Venus 1, Sun 2, Moon 3). Then:

At age 0 the year opens with the janma lord itself; each birthday advances the seed one place.

Sub-periods: the same fractions again

Each mahadasha is subdivided by the identical Vimshottari proportions. Within a period, a sub-lord’s antardasha is (its years / 120) of that period’s length, running in cycle order starting from the period’s own lord. AstroShruti snaps the last sub-period exactly onto its parent’s end, so accumulated rounding can never open a gap in the timeline. It is the fractal structure of natal Vimshottari, scaled down one further level.

The first-period balance — and the deliberate divergence

This is where implementations genuinely disagree, so it is worth being precise.

At the natal level, a Vimshottari mahadasha is already running at birth — you are born partway through the Moon’s dasha, say, with only the balance ahead of you. Mudda inherits this. The fraction of the janma nakshatra the natal Moon had already traversed counts as the fraction of the first period already spent when the year opens. So AstroShruti back-dates the opening mahadasha to begin before the Varsha Pravesh, and only its balance runs inside the year.

A consequence: because the first period starts early, the nine periods run out shortly before the next Varsha Pravesh, and the cycle wraps — the opening lord returns to close out the year, exactly as a Vimshottari cycle does at the natal level.

This is a real fork, and AstroShruti states its choice openly. Following Charak, the first period is the Mudda dasha already operating at the start of the year, with a balance. Other software instead starts a full first period at the Varsha Pravesh with no balance — which pushes every later boundary correspondingly further out. AstroSage is one such calculator; the widely-used PyJHora library also diverges here. AstroShruti’s Varshaphala engine has been externally validated, and the balance convention is surfaced in the output so a reader sees the decision rather than wondering why another tool disagrees.

How to read a Mudda timeline

• The running mahadasha at a given moment is the broad theme of that stretch of the year; its running antardasha narrows it to a signification within.
• Read the lord’s condition in the annual chart — its dignity, its house, and especially any Ithasala or Ishrafa it holds. A Mudda period of a lord that carries an applying Ithasala is when that promise delivers.
• Cross-reference the Sahams: a Mudda period of a planet tied to a Saham times when that Saham’s matter comes forward.
• If you look ahead to a future year’s Mudda, note that no period is “running” now — AstroShruti reports the running lord as none when the asked-for moment falls outside the year, rather than mislabelling a period as live.

Contrast with natal Vimshottari

Mudda and Vimshottari share their lords, order and proportions — the difference is scale and seed. Natal Vimshottari runs 120 years from the birth-Moon’s nakshatra; Mudda runs one year from a seed that shifts one place each birthday. So the same native experiences a different opening lord in each annual chart, and the whole nine-lord story compresses into roughly twelve months rather than a lifetime.