What Dasas Are

A Vedic chart shows the whole life. Dasas show which part is active right now.

The Sanskrit word dasa (sometimes written dasha) means a period. A dasa is a span of years governed by one planet. During those years, that planet's themes are emphasized in the person's experience.

Most charts in modern practice run on a system called Vimshottari Dasa. It cycles through nine planets in a fixed order over 120 years. The starting planet is determined by the Moon's nakshatra at birth.

What Brihat Jataka chapter 8 teaches

Brihat Jataka chapter 8 teaches a different dasa system from Vimshottari. The Brihat Jataka system depends on chapter 7 (length of life), which this study guide skips for the reasons set out in the introduction. The chapter 8 system divides a life into periods based on which house category each planet sits in: kendra, panaphara, or apoklima BJ 8.1.

Vimshottari, the system most modern practitioners use and the one this site's engine implements, comes from a parallel classical lineage. Brihat Jataka itself acknowledges Vimshottari in passing as the Udu or Nakshatra Dasa, and notes that this nakshatra-based system is the one Indian astrologers in practice tend to prefer BJ 8.23.

So this module acknowledges Brihat Jataka's chapter 8 system but teaches Vimshottari as the working tool. The full classical exposition of Vimshottari lives in Brihat Parashara Hora Shastra chapters 46 and 47 BPHS 46.1.

Why Vimshottari

Three practical reasons.

First, the starting point is fixed. Every chart has a Moon, every Moon sits in one of 27 nakshatras, and each nakshatra has an assigned planet. The starting dasa is automatic.

Second, the period lengths are fixed. The Sun is always 6 years, the Moon is always 10, and so on through the nine planets. The total cycle is always 120 years. No per-chart calculation is needed beyond the starting offset.

Third, Vimshottari uses all nine planets, including Rahu and Ketu. The two nodes carry meaningful periods of 18 and 7 years, and modern practice reads them as full participants in the timing picture.

What this module covers

Five lessons:

1. What dasas are. The basic concept.
2. Vimshottari proportions and sequence. The numbers and the order.
3. Reading the mahadasa. What a current planet's period brings into a life.
4. Bhukti and antardasa. The sub-periods inside a mahadasa.
5. Sade Sati and basic transit reading. The slow planets that interact with the dasa picture.

After this module, you can answer two questions for any chart. Which planet's period is active right now, and what does that period emphasize.

Practice

Open your chart in the Chart Explorer. Find the dasa panel. Note the planet that owns the current mahadasa, how many years are left in it, and the bhukti (the sub-period) running inside it.

The next four lessons unpack what these names mean and how to read them.