Vimshottari dasha is a traditional Vedic astrology timing system built around a 120-year cycle. A mahadasha is a major period; an antardasha is a subperiod within it. A label such as “Sun / Mercury” means Sun mahadasha and Mercury antardasha, not that the Sun and Mercury occupy the same house.
The schedule helps an astrologer discuss the themes of a period in the context of your chart. Learning its dates and labels is a useful first step.
The nine major periods
The cycle follows this repeating sequence. Its 120-year total describes the system, not your lifespan.
| Dasha lord | Mahadasha duration |
|---|---|
| Ketu | 7 years |
| Venus | 20 years |
| Sun | 6 years |
| Moon | 10 years |
| Mars | 7 years |
| Rahu | 18 years |
| Jupiter | 16 years |
| Saturn | 19 years |
| Mercury | 17 years |
Rahu and Ketu are the lunar nodes, rather than physical planets. They nevertheless have assigned periods in this traditional system. Sanjay Rath’s Vimshottari explanation discusses the classical framework, starting period, and birth-period balance.
Why your first period may be partly finished at birth
In the common Moon-based calculation, the Moon’s birth nakshatra identifies the starting dasha lord. The Moon’s progress through that nakshatra determines how much of the first period remains.
For an illustrative example, imagine the Moon is halfway through a nakshatra assigned to Venus. Half of Venus’s 20-year period would remain: approximately 10 dasha years. That is why a calculated mahadasha can begin before your birth date; the boundary comes from the Moon’s position and the year convention used in the calculation.
How an antardasha fits inside a mahadasha
Each mahadasha is divided into subperiods in proportion to the nine major-period durations. The antardasha duration is calculated as:
Mahadasha years × subperiod lord’s years ÷ 120
Within a Sun mahadasha, a Venus antardasha lasts 6 × 20 ÷ 120 = 1 dasha year. Within a Venus mahadasha, a Sun antardasha also lasts one dasha year, but the major-period context is different.
The sequence inside a mahadasha starts with that major period’s own lord. A Sun mahadasha therefore begins with Sun / Sun, then proceeds through Moon, Mars, Rahu, Jupiter, Saturn, Mercury, Ketu, and Venus.
Find your current dasha and read its dates
Your free Vedic birth chart includes the full dasha timeline. It opens at your current main period and lists all nine subperiods, with the current one highlighted. Use Previous, Next or the period selector to explore earlier and later periods, and Back to current to return to today’s period.
Each period keeps its actual start and end dates. A period already running can start before the display window; one still running at the end can finish beyond it. Reopening a saved chart preserves that window. Use Update my free chart for a schedule starting from a new calculation date.
Dates are displayed in the birth timezone. Each period ends at the instant the next begins; date-only labels omit that time of day. Two adjacent rows can therefore share the same calendar date without overlapping in the underlying schedule.
Why different calculators can show different dates
Check the recorded birth time and timezone first, followed by the ayanamsa and exact Moon position. Small differences in the starting position can affect the birth-period balance.
The length assigned to a dasha year also matters. Vedic Starlight uses a 365.25-day dasha year for new charts. When comparing a saved chart with another calculator, check the convention printed below the chart as well as the birth details.
Use timing as context, not a verdict
A period’s lord is interpreted in relation to its placement and the wider chart. Reading a general description of a Saturn or Rahu period is not the same as receiving a chart-specific interpretation. Avoid treating a planet’s name as an automatic label for a good or bad stretch of life.
A useful way to reflect is to keep dated notes of an interpretation and what actually happens. Record experiences that do not fit as well as those that do. This helps you return to the reading without relying only on memory.
Common questions
Is a dasha the same as a transit?
No. Dashas divide a traditional timing cycle into periods. Transits describe moving celestial positions relative to a reference chart. Practitioners may consider both, but they are different techniques.
Can a dasha guarantee marriage or a career change?
No. A dasha label alone cannot establish an event or its date. A reading should consider the wider chart and your circumstances, while making clear that a forecast is uncertain.
Where should I begin if the terminology is unfamiliar?
Start with viewing your free Vedic birth chart, then read about Moon signs and nakshatras. When you have your own chart, use its dasha dates to follow the main period and subperiod together.
