Vedic timing guide
Vimshottari Dasha sequence and calculation
The Dasha timeline begins with a measurable fraction of the birth nakshatra and expands through a fixed planetary sequence.
Vedic Astrology · 9 minute read
Written and reviewed by ReadAstrology Editorial & Calculation Team. Published 2026-07-18T00:00:00-05:00. Modified 2026-07-18T00:00:00-05:00.
Key takeaways
- The sequence totals 120 years with fixed planetary lengths.
- The Moon's remaining nakshatra fraction sets the first period balance.
- Natal context is required for traditional interpretation.
Methodology: ReadAstrology keeps the Moon longitude, nakshatra fraction, period lengths, and date arithmetic visible.
Astrology and numerology are cultural and symbolic traditions, not scientifically validated methods for predicting events, diagnosing conditions, or guaranteeing outcomes.
Sources and calculation references
- Swiss Ephemeris General Documentation — Astrodienst AG. Planetary, lunar, house, aspect, and coordinate calculation background.
- IANA Time Zone Database — Internet Assigned Numbers Authority. Historical civil-time offsets and daylight-saving rule provenance.
The 120-year sequence
Vimshottari assigns fixed year lengths to Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, and Mercury, totaling 120 years.
The sequence is fixed; the starting planet is determined by the ruler of the Moon's birth nakshatra.
Calculating the birth balance
Measure the Moon's progress through its 13-degree-20-minute nakshatra. The untraveled fraction is multiplied by the ruling planet's full period length.
That remaining duration becomes the balance of the first Mahadasha from birth. Exact timestamp handling affects the resulting dates.
Antardasha subdivisions
Each Mahadasha is subdivided into Antardashas in the same planetary order. Their lengths are proportional to each planet's years within the 120-year cycle.
Further subdivisions can be calculated using the same proportional logic, but more precision does not guarantee more reliable interpretation.
Interpretation requires natal context
Traditional readings consider the period planet's sign, house, rulership, strength, aspects, and combinations in the natal chart.
The timeline is deterministic within the selected rules. Claims about events or outcomes remain interpretive and should acknowledge uncertainty.
Frequently asked questions
How is the first Mahadasha calculated?
It comes from the ruler of the Moon's birth nakshatra, with the remaining period based on the Moon's untraveled fraction of that nakshatra.
How long is the Vimshottari cycle?
The complete sequence totals 120 years.
Why do Dasha dates differ between websites?
Differences can come from ayanamsha, Moon longitude, birth-time conversion, calendar arithmetic, rounding, or boundary handling.