Jyotisha calculation guide
विंशोत्तरी दशा
A 120-year sequence of graha periods derived from the birth Moon nakshatra.
Learn how the birth Moon nakshatra determines Vimshottari Mahadasha, Antardasha, Pratyantardasha, and the remaining Dasha balance at birth.
The birth Moon nakshatra determines the first Dasha lord and the balance remaining at birth.
The complete lord sequence totals 120 nominal years and repeats in a fixed order.
Sub-period duration is proportional to the child lord years: parent duration multiplied by child lord years divided by 120.
The Vimshottari order is Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, and Mercury. Their nominal periods are 7, 20, 6, 10, 7, 18, 16, 19, and 17 years, totaling 120.
The sequence does not necessarily begin with Ketu at birth. The Moon nakshatra identifies the active lord, and the degree already travelled through that nakshatra determines how much of its Mahadasha has elapsed.
Each nakshatra spans 13 degrees 20 minutes. Divide the Moon progress within its nakshatra by that span to obtain the elapsed fraction. The remaining fraction multiplied by the nakshatra lord period gives the balance at birth.
A small change in Moon longitude near a nakshatra boundary can change the starting lord. Exact birth time and a consistent sidereal convention therefore matter.
Every Mahadasha contains nine Antardashas in the same cyclic lord order, beginning with the Mahadasha lord. Every Antardasha is divided again into nine Pratyantardashas by the same proportion.
Samvat calculates period boundaries and the active nested lords for a selected date. It does not attach predictions, event promises, remedies, or personal advice to those dates.
Every nested duration is a fixed proportion of its parent period.
child duration = parent duration x child lord years / 120Samvat uses an explicit 365.25-day Vimshottari year and preserves exact UTC boundaries in the calculation output.
The encoded rules are tied to these cited passages.
Use these as working patterns when reading Panchang details or planning around Hindu dates.
You need the Mahadasha, Antardasha, and Pratyantardasha active on one civil date.
The result identifies three active period lords and their exact start and end boundaries.
Two sites show slightly different Dasha boundary dates.
The disagreement can usually be traced to an explicit input or convention instead of guesswork.
The Dasha sequence is a deterministic calendar derived from one lunar position and a traditional proportional rule.
Calculating its dates accurately is a separate task from interpreting what those periods mean for a person.
It is calculated from the birth Moon sidereal nakshatra. The nakshatra lord starts the sequence, and the untravelled fraction of the nakshatra gives the first Mahadasha balance.
The nine nominal Mahadasha periods total 120 years.
Multiply the parent Mahadasha duration by the Antardasha lord nominal years and divide by 120.
No. It calculates birth balance, period boundaries, and active lords without predictive readings.