Dasha calculator: your periods of life in Vedic astrology

What is a dasha, and what does the calculator show?

A dasha (“period”, “state”) is a season of life ruled by a planet. The most widely used system, the Vimshottari, strings nine major periods along a 120-year cycle, always in the same order: Ketu 7 years, Venus 20, the Sun 6, the Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19, Mercury 17. The page what is a dasha introduces the other systems; the calculator follows the Vimshottari. Its result has four parts:

• The starting point: the nakshatra of your Moon, and the share of its period already elapsed at your birth.
• The current period: today’s mahadasha and antardasha, with their start and end dates.
• The timeline of your major periods, dated, in the order they follow one another; each one leads to its page.
• The nine antardashas of each mahadasha, unfolded with one tap, with their dates.

Which mahadasha are you born in? The starting point

Your life begins in the period of the ruler of your Janma nakshatra, the nakshatra the Moon occupied. But not at the start of that period: the Moon had already covered part of its nakshatra, and the period is under way in the same proportion. The calculator shows that elapsed share; what remains of the period opens your life.

An example: a Moon at 10° sidereal Scorpio is in Anuradha, from 3°20′ to 16°40′ Scorpio, a nakshatra ruled by Saturn. It has covered 6°40′ out of 13°20′, half the way. The Saturn mahadasha, 19 years long, is therefore half over at birth: 9 years and 6 months of it remain. The rest follows in the order of the cycle:

1. Saturn: from birth to 9 years and 6 months.
2. Mercury (17 years): from 9 years and 6 months to 26 years and 6 months.
3. Ketu (7 years): from 26 years and 6 months to 33 years and 6 months.
4. Venus (20 years): from 33 years and 6 months to 53 years and 6 months.
5. Then the Sun (6 years), the Moon (10 years), Mars, Rahu, Jupiter, and the cycle comes back to Saturn.

What is my current mahadasha? Reading the present period

The line for the current period gives two planets and their dates. The mahadasha sets the scenery for years; the antardasha tells you which scene is being played for a few months or a few years. They are named together, the major one first: “Venus–Sun” reads “the Sun sub-period within the Venus major period”.

The sub-periods follow the order of the cycle, starting with the planet of the major period itself, and their length equals the years of the major period times those of the minor one, divided by 120. In the Venus mahadasha (20 years), Venus–Venus lasts 3 years and 4 months, Venus–Sun exactly 1 year, Venus–Moon 1 year and 8 months. The end date of your antardasha tells you when the scene changes.

To read the pair of planets, look at how they get along in your chart: their signs, their houses, the distance between them. Two planets on good terms make the sub-period flow; under tension, they call for adjustments, and that is often where you grow the most.

The timeline of your major periods: how to read it

The timeline lines up your mahadashas with their dates, and each one leads to its page, which details what it activates and its nine sub-periods. The Venus mahadasha speaks of bonds, art and what holds value in your eyes; the Rahu one, of the appetite for the new and of ambition. The nature of the planet gives the colour; your chart tells you how that colour takes in your life.

Read the planet of each period with three questions. Which house does it occupy, counted in whole signs from the Ascendant? Which houses does it rule? How does it fare in the D9? A planet that is strong in both the D1 and the D9 keeps its promises throughout its period.

The passage from one mahadasha to the next, which tradition calls dasha sandhi (the junction), is often lived as a change of season: what carried the past years closes, another register opens. Spotting these dates on the timeline lets you prepare for them rather than discover them afterwards.

The unfolding antardashas: nine sub-periods per major period

Under each mahadasha of the timeline, one tap unfolds its nine antardashas, dated. Their length varies a great deal: in the Rahu mahadasha (18 years), the first, Rahu–Rahu, lasts 2 years, 8 months and 12 days, and the shortest, Rahu–Sun, 10 months and 24 days; in the Sun mahadasha (6 years), Sun–Sun lasts only 3 months and 18 days.

Unfold the current mahadasha and find today’s sub-period, then the next one: that is the most useful horizon for your plans. The last sub-period of a major period always belongs to the planet that precedes it in the cycle, Jupiter at the end of Saturn, Mars at the end of Rahu: it closes the season and prepares the next.

Why the exact birth time matters for your dashas

The whole calendar starts from a single point: the degree of the Moon. And the Moon moves about half a degree an hour. In the Anuradha example, half a degree is nearly 4% of the nakshatra, so nearly 4% of Saturn’s 19 years: about eight and a half months. An hour’s error on the birth time therefore shifts every date on the timeline by several months, in the same direction.

The gap depends on the first period: with the Sun (6 years) as the starting point, an hour weighs nearly three months; with Venus (20 years), about nine months. And if the Moon was near the edge of a nakshatra, an hour more or less can change the starting ruler: the whole timeline then takes on a different face.

Use a recorded birth time rather than a family memory. If two times are going around, calculate both and compare the changes of period with the major turning points of your life: the one that fits best is often the right one.

One period, one climate: how to use it

A dasha tells you which part of your chart comes to the fore, not an event written in advance. The Jupiter period invites you to learn and to pass things on, the Mercury period to exchange and to write, the Mars period to launch projects. The more demanding periods have their levers: under Saturn, patience builds something solid; under Ketu, letting go of what weighs you down makes room for what matters.

Dashas are also read with transits, the passage of today’s planets over your chart: a striking transit speaks louder when it touches the planet of your current period. And to find first the nakshatra that sets this whole calendar, the nakshatra calculator gives it with its pada, its ruler and its deity.