Vimshottari dasha, end to end

A birth chart tells you the promise. A dasha tells you the timing. Vimshottari is the dasha system used by the overwhelming majority of Vedic astrologers, and it is the one Parashara presents first. This article walks the whole machine: the 120-year wheel, where your starting point comes from, and how the nested sub-periods are calculated.

The 120-year wheel

Vimshottari (“of one hundred and twenty”) assigns each of the nine grahas a fixed number of years. They always run in the same order, and the periods always sum to 120:

Add them up: 7 + 20 + 6 + 10 + 7 + 18 + 16 + 19 + 17 = 120 years. After Mercury, the cycle returns to Ketu and repeats. Almost nobody lives through a full turn, which is part of the point — the system is built to cover a human lifetime with room to spare.

Where you enter the wheel: the birth nakshatra

You do not start at Ketu. You start at the planet that rules the nakshatra the Moon occupied at your birth. The 27 nakshatras are assigned to the nine planets in the Vimshottari order, three nakshatras per planet:

• Ketu rules Ashwini, Magha, Mula.
• Venus rules Bharani, Purva Phalguni, Purva Ashadha.
• Sun rules Krittika, Uttara Phalguni, Uttara Ashadha.
• Moon rules Rohini, Hasta, Shravana.
• Mars rules Mrigashira, Chitra, Dhanishta.
• Rahu rules Ardra, Swati, Shatabhisha.
• Jupiter rules Punarvasu, Vishakha, Purva Bhadrapada.
• Saturn rules Pushya, Anuradha, Uttara Bhadrapada.
• Mercury rules Ashlesha, Jyeshtha, Revati.

So if your Moon is in Rohini, your life opens in a Moon mahadasha. If it is in Mula, you open in Ketu. The rest of the wheel then follows in fixed order from there.

The starting balance: you rarely begin at zero

You are almost never born at the exact start of a nakshatra, so your first mahadasha is already partly spent. The unelapsed portion — the “balance of dasha” — is proportional to how much of the nakshatra the Moon had left to travel.

Each nakshatra spans 13°20′ (that is 800 arcminutes). Suppose the Moon has covered 5°00′ of its birth nakshatra, leaving 8°20′ to go. The fraction remaining is 8°20′ ÷ 13°20′ = 500′ ÷ 800′ = 0.625. If that nakshatra’s lord is Jupiter (16 years), your starting Jupiter mahadasha balance is 0.625 × 16 = 10 years. You were, in effect, born 6 years into a Jupiter period.

Nesting: antardasha and below

A mahadasha is too coarse on its own — a 19-year Saturn period is not uniformly “Saturn” for nineteen years. So each mahadasha is subdivided into antardashas (also called bhuktis), which follow the same nine-planet order, but starting from the mahadasha lord itself.

The length of any antardasha is its own proportional share of the mahadasha:

The same rule recurses. Inside each antardasha you get pratyantardashas, then sookshma, then prana — each computed by the identical proportional formula one level down. In practice, three levels (maha → antar → pratyantar) are enough to time most events to within a few weeks.

A worked slice

1. 1Mahadasha: Rahu, 18 years.
2. 2First antardasha is Rahu’s own: (18 × 18) ÷ 120 = 2.7 years.
3. 3Next antardasha is Jupiter (the order after Rahu): (18 × 16) ÷ 120 = 2.4 years.
4. 4Inside Rahu–Jupiter, the first pratyantardasha is Jupiter again: (2.4 × 16) ÷ 120 = 0.32 years ≈ 3.8 months.

Reading it, not just computing it

The arithmetic is the easy half. The judgment is in what each period actually delivers, and that depends on the planet’s condition in the chart: which houses it owns, where it sits, its dignity, the company it keeps, and how the running planet relates to the mahadasha lord. A well-placed dasha lord ripens the good promise of the chart; an afflicted one brings its difficulties forward in time.

The dasha does not invent events. It releases what the natal chart already promised — on a schedule.

When you ask MyPanditji about timing, this is the engine underneath: your exact Moon longitude sets the balance, the Swiss Ephemeris fixes the positions, and the period lords are then read against the natal chart rather than in the abstract.