Reading the Dasha (planetary periods)
Vedic astrology has a system called Dasha that divides life into planetary periods and reads what kind of wind is blowing in the current one. It is a way of reading time that is distinct from Western transits and unique to Vedic astrology. Here we take up the most widely used version, the Vimshottari Dasha, and explain how it is calculated and what each planetary period is like.
What a Dasha is
Dasha means "state" or "period" in Sanskrit, and refers to a system that divides a life into periods ruled by planets. There are many kinds, but the standard one is the Vimshottari Dasha, in which nine planets take turns as the lead actor in a life, adding up to 120 years. Each planet's allotted time is fixed: Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17.
The calculation starts from the Moon's Nakshatra at birth
Which planet's period a life begins with is decided by the Nakshatra (lunar mansion) the Moon occupied at the moment of birth. Each of the 27 Nakshatras is assigned to one of the nine planets: a Moon in Ashwini starts in the Ketu period, a Moon in Rohini in the Moon period. How far the Moon had travelled through that Nakshatra determines how many years of the first period remain. A birth time that is off by a few hours moves the Moon's position, and with it the dates on which the Dashas change. This is one reason an accurate birth time matters.
Mahadasha and Antardasha
The large periods lasting from several years to twenty are called Mahadasha (major periods). Each is further divided into nine sub-periods called Antardasha. Within a 19-year Saturn period, for example, the sub-periods run Saturn/Saturn, Saturn/Mercury, Saturn/Ketu and so on in turn. In practice, the major period gives the broad quality of the time and the sub-period gives the specific colour of that year or few years. They are usually written major/sub, as in "Saturn/Jupiter".
The character of each planetary period
The Jupiter period tends to bring learning, expansion and connections with supporters, and is often spoken of in connection with marriage and children. The Saturn period is a time of responsibility and endurance in which effort accumulates but sudden change is unlikely. The Rahu period intensifies abrupt changes of environment and involvement with foreign places or new technology; rise and confusion sit side by side. The Ketu period is one of introspection and letting go, when old attachments fade. Venus is relationships, art and comfort; the Sun is establishing oneself and social standing; the Moon is emotion and home; Mars is action and competition; Mercury is knowledge, work and negotiation. These are generalities only. The same Jupiter period looks completely different depending on which house Jupiter occupies in your chart and what condition it is in.
The basics of reading a Dasha
To read a Dasha, first check where the ruling planet sits in the birth chart, which houses it rules, and whether it is strong or weak. The Dasha is like a timer that shows when the placements in the birth chart become active; the period itself is neither good nor bad. Next, expect the themes of the houses that planet governs (marriage for the 7th, work for the 10th) to come to the fore during that period. Finally, layering the current transits of Jupiter and Saturn narrows the timing. The procedure for marriage timing and career timing is also covered in the respective guides.
Things to keep in mind
The Dasha shows the quality of a period; it does not fix events. In the same Saturn period, one person settles in and builds strength while another feels stuck. The year or so around the change from one major period to the next is usually read as a transition in which both planets' influence mixes. A Dasha table can be calculated automatically from your date, time and place of birth. The free reading on this site gives your current major and sub-period; the full lifetime report covers the complete Dasha sequence for your life and a reading of each period.
This article introduces general ideas from Vedic astrology. It does not guarantee future events and is not a substitute for medical, legal or financial advice.