Ketu Mahadasha: seven years, nine sub-periods, and what the texts actually attach to them

Ketu's Mahadasha runs for seven years out of the 120-year Vimshottari cycle. It follows Mercury's seventeen years and hands over to Venus's twenty. It is usually described in one word, detachment, and the classical chapter on it does not use that word at all. BPHS Ch. 47 opens its Ketu passage with good relations with authority, conveyances, children and gain from abroad, and attaches the losses to stated placements. This page sets out those conditions with chapter and sloka, and shows how to check each one with the Vimshottari Dasha calculator. For the graha itself, read Ketu in Vedic astrology; for the system as a whole, what a Mahadasha is.

Seven years of 120: the arithmetic

BPHS Ch. 46 Sloka 15 gives the nine Vimshottari spans as 6, 10, 7, 18, 16, 19, 17, 7 and 20 years for the Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, Ketu and Venus. Ketu's seven years equal Mars's and are shorter than every other period except the Sun's six. Seven of 120 is 5.83 per cent of the cycle. This app's engine holds the same numbers in one table, DASHA_SEQUENCE, written in the order Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, and counts a year as 365.2425 days. A full Ketu Mahadasha is therefore 2,556.7 days.

The order matters in a way that is easy to miss. BPHS Ch. 46 Sloka 12-14 counts the lords from Krittika, which makes the Sun first and Ketu eighth. The engine counts from Ashwini, the first nakshatra of the zodiac, which makes Ketu first. These are the same wheel read from two starting points: Krittika is the third nakshatra, and the Sun is the third lord in the engine's list. The practical result is that Ketu rules the first, tenth and nineteenth nakshatras.

Ketu's place in Vimshottari is not something every dasha system grants. In the same chapter, Sloka 17-20 describe Ashtottari, a 108-year scheme with eight lords, and the translation remarks that Ketu has been denied the privilege of ruling a period there. The alternate dashas calculator shows the other systems; this page describes Vimshottari, which Sloka 12-14 call the most appropriate.

When the Ketu Mahadasha arrives

The first Mahadasha of a life belongs to the lord of the Moon's nakshatra at birth. The engine takes the nakshatra index, divides by nine and uses the remainder to pick the starting lord, so a Moon in Ashwini, Magha or Mula starts life in Ketu's period. How much of the seven years is left depends on how far the Moon has travelled through the nakshatra. BPHS Ch. 46 Sloka 16 states the rule: multiply the Dasha's years by the expired part of the Moon's stay and divide by the whole stay; that is the expired Dasha, and the rest is the balance at birth. The engine does the same thing with a fraction between 0 and 1. A Moon exactly halfway through Magha leaves three and a half years of Ketu. Check your own star with the nakshatra calculator.

For everyone else the Ketu period arrives later, after the periods ahead of it in the sequence. The table gives the age range in which it begins for each birth-star group. The lower figure assumes the first period was almost spent at birth, the upper that it was almost untouched.

Two things follow. First, many people never reach a Ketu Mahadasha in adult life, or meet it only in childhood: a Mercury-star birth can pass through it before the age of twenty-four. The text gives no separate rule for a childhood dasha. Second, the start date moves with the Moon's exact longitude, and the Moon covers a nakshatra in about a day. An uncertain birth time shifts every boundary; the birth-time-unknown page explains how large that shift can be.

What BPHS says: Chapter 47

BPHS Ch. 47 is the chapter on the effects of the nine Dashas. Sloka 2 divides those effects into two kinds: general ones that come from the nature of the graha, and distinctive ones that come from its placement. Sloka 71 introduces Ketu with a single image, the headless trunk (Kabandha) among the grahas. Sloka 72-77 then give the whole of what Parashara says about the period. The passage is short, and it is built from four conditional statements.

1. 1.Ketu in an angle (Kendr), a trine (Trikon) or the 11th, in a benefic's sign, in exaltation or in its own sign: cordial relations with the ruler, a desired headship of a district or village, comforts of conveyances, happiness from children and spouse, gain from foreign countries and acquisition of cattle.
2. 2.Ketu in the 3rd, 6th or 11th: acquisition of position (the text says a kingdom), good relations with friends, and opportunities to acquire elephants, which in the idiom of the text means the trappings of rank.
3. 3.By phase: at the commencement there is Raj Yog; in the middle there are possibilities of fearfulness; in the last part there are ailments and journeys to distant places.
4. 4.Ketu in the 2nd, 8th or 12th, or receiving the aspect of a malefic: confinement, loss among kinsmen and of the residence, anxieties, low company and illness.

The first point is that the favourable list comes first and is the longer one. Nothing in Sloka 72-77 says the Ketu period is bad by nature; it says the period follows the house and sign Ketu holds.

The second is that the house lists are specific to Ketu and do not match the general rule a few slokas earlier. Sloka 5-6 of the same chapter say a Dasha is unfavourable when its lord is in the 6th, 8th or 12th. Sloka 72-77 name the 6th among the houses where Ketu gives rank and friends, and put the 2nd in the unfavourable group instead. The text does not comment on the difference. A Ketu in the 6th is therefore favourable by the special rule and unfavourable by the general one, and an honest reading says so.

The third is the phrase about exaltation and own sign. For seven grahas BPHS fixes those signs precisely. For the nodes the tradition offers rival schemes, which the Ketu page compares side by side. Within the dasha chapters themselves the nearest statement is Ch. 50 Sloka 42, which says that four signs counted from Vrischika belong to Ketu and that a Dasha is productive of good when Ketu sits in one of them. That sloka sits in the chapter on sign-based Dashas, so applying it to Vimshottari is an inference. The uncontested clause is Ketu in a benefic's sign, which you can read off the birth chart.

Beginning, middle and end

Ch. 47 Sloka 3-4 give a general rule for when within a period the effects are felt. A graha in the first decanate (Dreshkan) of its sign delivers at the commencement, one in the second in the middle, one in the third at the end. A retrograde graha reverses the order, and the sloka adds that Rahu and Ketu, who are always retrograde, always deliver in the reverse order. The engine marks Ketu retrograde on every chart for the same reason. So by this rule a Ketu between 20 and 30 degrees of its sign shows its results early in the seven years, and a Ketu between 0 and 10 degrees shows them late. The Drekkana (D3) calculator shows which third of the sign each graha holds.

Sloka 72-77 then give a second, fixed pattern for Ketu: Raj Yog at the start, fearfulness in the middle, ailments and distant journeys at the end. The chapter states both and does not reconcile them. The reasonable reading is that the fixed pattern is the general effect of the graha and the decanate rule adjusts when the placement-specific results land, which is the distinction Sloka 2 draws. That is an interpretation, not a quotation.

House lordship: where Ketu differs from the other eight

BPHS Ch. 48 reads a Dasha through the houses its lord rules. Sloka 2-8 run through all twelve: well-being in the Dasha of the Lagna lord, house and land in the Dasha of the 4th lord, learning and children under the 5th lord, recognition under the 10th lord, and so on. Ketu rules no sign in the scheme this app uses, so none of those twelve sentences attaches to it directly. In the engine the function that builds the house-lordship lines looks each sign up in a table of seven sign lords; for a Ketu Mahadasha it returns an empty list. That is the code declining to assign Ketu a house it does not own.

What Ch. 48 does offer for Ketu is association. Sloka 14-17 say the Dasha of a graha that is conjunct the lord of an angle or a trine, or that receives the aspect of such a lord, becomes favourable, and that even the Dasha of a 6th, 8th or 12th lord improves through association with a trine lord. Ch. 59 uses the same idea in its very first sloka, where the good results of Ketu-Ketu depend on Ketu being related to the lord of the 9th, 10th or 4th. For a graha with no sign of its own, the graha it sits with and the lord of the sign it sits in carry much of the reading.

The nine antardashas of the Ketu Mahadasha

BPHS Ch. 51 Sloka 1 gives the arithmetic: multiply the years of the Dasha lord by the years of the sub-period lord and divide by 120. Sloka 2 fixes the order: the first Antar Dasha belongs to the Dasha lord and the rest follow the usual sequence. Inside Ketu the order is therefore Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury. The engine applies one function, subdivideVimshottari(), at every level. Antardasha and pratyantar explains the levels in general.

BPHS Ch. 59 gives the effects of each of these nine in 79 slokas. Every section has the same structure, and seeing the structure is more useful than memorising the outcomes. There are four tests: the dignity and house of the sub-period lord; its position counted from the Dasha lord, that is, from Ketu; whether it is associated with the lords of the 9th and 10th; and whether it rules the 2nd or 7th. The summaries below keep the conditions and compress the results.

Ketu-Ketu (Sl. 1-6)

With Ketu in an angle or trine, or related to the lord of the 9th, 10th or 4th, the text gives happiness from spouse and children, recognition from authority and gain of land, and inserts the words 'but mental agony' in the middle of that favourable list. With Ketu in its sign of fall, or in the 8th or 12th together with a combust graha, it gives loss of reputation and wealth, distress in the family and instability of mind; the text also names heart trouble here, which is reported as its wording and is not medical advice. With Ketu in the 2nd or 7th, or related to their lords, it speaks of illness and separation from kinsmen.

Ketu-Venus (Sl. 7-15)

The longest sub-period, fourteen months. Venus exalted, in its own sign, or with the 10th lord in an angle or trine: favour from authority, good fortune, recovery of a lost position, conveyances, visits to sacred places and gain of land. If the 9th lord joins as well, the text says fortune dawns. Venus in an angle, trine, 3rd or 11th from Ketu: sound health, well-being at home, good food and conveyances. Venus in the 6th, 8th or 12th from Ketu: quarrels without cause and loss of wealth. Venus in fall, with a fallen graha, or in the 6th or 8th house: quarrels with relatives, loss of reputation and money, and the text's list of head and eye complaints.

Ketu-Sun (Sl. 16-24)

Sun exalted, in Leo, or joined or aspected by a benefic in an angle, trine or the 11th: gain of wealth, favour from authority, pious work and ambitions met. Sun with malefics in the 8th or 12th: trouble with authority, separation from parents, foreign travel, antagonism with friends and fever. Sun in an angle, trine, 2nd or 11th from Ketu: fitness, gain, success in good works, a small headship. Sun with malefics in the 8th or 12th from Ketu: obstacles and loss, with the note that distress comes at the start of the sub-period and eases toward its end.

Ketu-Moon (Sl. 25-36)

Moon exalted, in Cancer, or in an angle, trine, the 11th or 2nd: recognition, enthusiasm, a house and land, unusual gains of food, clothes and conveyances, success in business and happiness in the family. The sloka adds that these are realised fully only if the Moon is waxing. Moon in fall or in the 6th, 8th or 12th: unhappiness, obstacles, separation from parents, business losses. A strong Moon in an angle, trine or the 11th from Ketu: land, cattle and success through relatives, with a phase pattern of its own, auspicious at the start, cordial relations with authority in the middle, and trouble from authority or a distant journey at the end. Moon in the 6th, 8th or 12th from Ketu: loss, anxiety and enmity with kinsmen.

Ketu-Mars (Sl. 37-44)

Mars exalted, in its own sign, or joined or aspected by benefics: land, increase of wealth and cattle, a new garden laid out, gain through authority. If Mars is related to the 9th or 10th lord the text says there will 'definitely' be gain of land. Mars in an angle, trine, 3rd or 11th from Ketu: recognition, popularity, happiness from children and friends. Mars in the 8th, 12th or 2nd from Ketu: danger while travelling abroad, needless troubles and quarrels, with the unusual rider that amid the evil effects there will be some auspicious ones too.

Ketu-Rahu (Sl. 45-50)

The two nodes together for just over a year. Rahu in exaltation, its own or a friend's sign, or in an angle, trine, the 11th, 3rd or 2nd: increase of wealth, grain, cattle and land, and the text specifies the source as a foreign (Yavana) ruler. It adds that there is some trouble at the start and that all is well later. Rahu with a malefic in the 8th or 12th: a list of fevers and bodily complaints in the text's own terms, with quarrels and loss of reputation. Rahu in the 2nd or 7th: distress and danger. Because Ketu is always exactly opposite Rahu, Rahu is by construction in the 7th from the Dasha lord throughout, which is why this section alone omits the from-the-Dasha-lord test. For the other side of the axis see Rahu Mahadasha.

Ketu-Jupiter (Sl. 51-60)

Jupiter exalted, in its own sign, or with the lord of the Lagna, 9th or 10th in an angle or trine: increase of wealth and grain, favour from authority, enthusiasm, conveyances, celebrations such as the birth of a child, pious works and victory over opponents. Jupiter in fall or in the 6th, 8th or 12th: loss, separation from family and bodily distress, with the note that some good may be felt at the start and only adverse results later. Jupiter with a benefic in an angle, trine, 3rd or 11th from Ketu: garments and ornaments, foreign journeys, taking care of relatives, decent food.

Ketu-Saturn (Sl. 61-68)

Saturn without strength and dignity: distress to self and relatives, loss through fines imposed by government, resignation from a post, foreign journeys and danger while travelling; oddly, the same list contains an increase in cattle wealth. Saturn in the 8th or 12th: loss and lethargy. Saturn in a trine, in Pisces, in Libra, in its own sign, in an auspicious Navamsa, or with a benefic in an angle, trine or the 3rd: success in all ventures, happiness from the employer, comfort in travel, more property at home and an audience with authority. Saturn with a malefic in the 6th, 8th or 12th from Ketu: obstacles, lethargy and loss of reputation. This is the only section that names the Navamsa, which the Navamsa (D9) calculator computes.

Ketu-Mercury (Sl. 69-79)

The closing sub-period. Mercury in an angle or trine, exalted or in its own sign: position, enjoyment, charity, wealth and land, the birth of a child, religious functions and, in the text's phrase, functions like marriage 'suddenly'. Mercury with the 9th or 10th lord: the company of learned people and the dawn of fortune. Mercury with Saturn, Mars or Rahu in the 6th, 8th or 12th: antagonism with officials, living in other people's houses and loss of possessions, with some benefit at the start, better results in the middle and an inauspicious end. Mercury in an angle, trine or the 11th from Ketu: health, opulence and unusual profit in business. A weak Mercury in the 6th, 8th or 12th from Ketu: trouble at the start, though the text allows visits to sacred places in the middle.

One level further: pratyantardashas

BPHS Ch. 61 Sloka 1 repeats the proportion for the third level: multiply the Antar Dasha by each graha's years and divide by 120. The opening Ketu-Ketu sub-period of 149.1 days thus splits into nine pratyantars of between 7.5 days (Sun) and 24.9 days (Venus).

Sloka 65-73 give one line for each pratyantar inside a Ketu Antar Dasha, and they are almost uniformly bleak: sudden reversal, going away to foreign lands and loss of wealth for Ketu's own; loss through a foreign ruler for Venus; antagonism with friends for the Sun; loss of grain for the Moon; trouble from opponents for Mars and Rahu; loss of friends and standing for Jupiter; meagre gain for Saturn; confusion and failure in study for Mercury. Sloka 2 of the same chapter, after its first example, says these are general effects and that they are not produced when the graha is in a trine, rules or occupies an auspicious house and holds a benefic divisional sign, and it instructs that all the other pratyantar effects be judged in that manner.

Ketu's sub-period inside the other eight Mahadashas

Ketu also recurs as a sub-period inside every other Mahadasha. The arithmetic is symmetrical, so its length there mirrors the table above.

The chapters do not treat these eight alike. In Rahu's period (Ch. 55 Sloka 40-41) the Ketu sub-period opens with foreign journeys and trouble from authority before any favourable condition is offered. In Saturn's period (Ch. 57 Sloka 16-18) the text makes a statement found nowhere else: the difficult effects, loss of position and foreign journeys among them, are said to arise even if Ketu is exalted, in its own or a benefic's sign, in an angle or trine, or aspected by benefics, and the relief it offers comes from Ketu being related to the Lagna lord. The sibling pages on the Sun, Moon, Mars, Jupiter and Saturn Mahadashas cover each of these in its own place.

What the other sources add, and where they are silent

Saravali, which supplies a second opinion for the seven visible grahas elsewhere in this series, has no passage on a Ketu Dasa. A search of the translation in this corpus finds Ketu only as a comet or Upaketu in verses on longevity and on the cancellation of Raja Yogas. Its Dasa chapters work with the seven grahas that own signs. So for this period there is no Saravali reading to set beside Parashara's, and this page does not invent one.

Advanced Predictive Astrology, the modern case-study book, gives numbered rules that touch Ketu. They are one practitioner's working rules and should be weighed as such.

• Rule 15: the dasa of Ketu occupying a particular house is said to confer long and frequent travels, name and fame, strange dreams and unusual inner experiences. The rule then adds a severe rider when Mars or Saturn aspects that Ketu. The house number is damaged in the scan of this book used here; it appears to read as the 8th, but that cannot be confirmed. If it is the 8th, the rule disagrees with BPHS Ch. 47, which lists the 8th among the houses where the Ketu period is difficult.
• Rules 13 and 16: a planet in close company of Rahu or Ketu is said not to give good effects in its own dasa, the more so the closer the orb, and the dasa of a planet closely conjunct Ketu in the 8th or 12th is called very bad. These concern the period of that other planet, not of Ketu.

How this app reads a Ketu Mahadasha

The app's verdict on a running Mahadasha comes from one function, buildDashaLordEffects(), which codes the general test of BPHS Ch. 47 Sloka 5-6: favourable when the lord is in the Lagna or in a strong dignity, unfavourable in the 6th, 8th or 12th or in a weak dignity. For Ketu it behaves differently from the seven sign-owning grahas.

• Dignity is always Neutral. The engine's dignity table has rows for the Sun through Saturn only. For Ketu the dignity function returns Neutral in every sign, so no chart is told that its Ketu is exalted, fallen, in a friend's sign or in an enemy's. This is deliberate: the classical schemes for the nodes disagree, and the code does not pick one.
• The binary verdict is favourable only in the 1st house. With no strong dignity available, the single route to the favourable sentence is Ketu in the Lagna. In every other house the summary uses the testing wording.
• The three-tier quality never reads good. dashaQuality() returns challenging when Ketu is in the 6th, 8th or 12th and neutral everywhere else, the Lagna included, because its top tier requires exaltation, Moolatrikona or own sign.
• No house-lordship lines appear. Ketu rules no sign in the engine's table, so the Ch. 48 list is empty for this period.
• Without a birth time there is no house. The chart is then computed without an ascendant, the house test cannot run, and the summary falls back to the testing wording with no house clause.
• The node is the mean node. The engine places Rahu from the mean lunar node and sets Ketu exactly 180 degrees from it, flagged retrograde.

The theme text attached to the verdict is short. On the favourable side it reads: detachment that pays off, sudden gains and a turn toward introspection or spiritual focus. On the testing side: disconnection, unexpected loss and a pull toward isolation. Both are prefixed with the words 'classically read as', which mark the claim as the tradition's and not the app's. The consequence of all this is that the app is more conservative about Ketu than BPHS Ch. 47 Sloka 72-77. A Ketu in the 10th or 11th, which Parashara's special rule treats well, will show a neutral quality and testing wording here. See the methodology page; the special conditions on this page are to be applied by hand. The same verdict feeds the Kundali and Timing views, and the AI Life Chat is grounded in it.

Checking a Ketu Mahadasha in your own chart

1. 1.Find the dates. Run the Vimshottari Dasha calculator. It returns the full timeline, the Mahadasha running today and its nine antardashas. It needs only a birth date, but the Moon moves about thirteen degrees a day, so a known time gives firmer boundaries.
2. 2.Find Ketu's house. Open the birth chart and note the house Ketu occupies from the Lagna. Compare it with Ch. 47 Sloka 72-77: angles (1, 4, 7, 10), trines (5, 9), the 3rd, 6th and 11th on the favourable side; the 2nd, 8th and 12th on the other.
3. 3.Find the sign lord. Note which graha rules the sign Ketu is in. A benefic's sign satisfies the first clause of Sloka 72. Then look at where that lord itself sits, since Ketu has no sign of its own to fall back on.
4. 4.Check conjunctions and aspects. A malefic aspect on Ketu is one of the two triggers for the difficult list in Sloka 77. A conjunction with the lord of an angle or trine is the improving condition of Ch. 48 Sloka 14-17, and a link to the 9th, 10th or 4th lord is the condition of Ch. 59 Sloka 1.
5. 5.Note the decanate. Use the D3 calculator or Ketu's degree: 0 to 10 degrees points to the end of the period, 20 to 30 to its start, by the reversed rule of Ch. 47 Sloka 3-4.
6. 6.For each antardasha, count from Ketu. Place the sub-period lord and count its house from Ketu's house, inclusive. Angles, trines, the 3rd and 11th are the favourable positions in Ch. 59; the 6th, 8th and 12th are not. Then check that lord's own dignity and whether it rules your 2nd or 7th.
7. 7.Look at the transit at commencement. Ch. 48 Sloka 5-8 ask for the lord's position when the period begins. The Gochar calculator shows current transits counted from your natal Moon.

If you want to know what Ketu's house placement is read as in its own right, the twelve house pages take them one at a time: 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th and 12th.

Common misreadings

• That it is a period of loss by nature. Ch. 47 Sloka 72-77 open with a favourable list and say the start of the period carries Raj Yog. The losses belong to the 2nd, 8th and 12th houses and to a malefic aspect.
• That it always means renunciation. The dasha chapter does not say so. Its vocabulary is headship, conveyances, children, land and foreign gain. The spiritual reading of Ketu comes from other parts of the tradition, and this app's own theme line draws on it, but Ch. 47 and Ch. 59 are worldly in their terms.
• That it is the same thing as Kaal Sarp. Kaal Sarp is a natal pattern in which the seven grahas fall on one side of the Rahu-Ketu axis; it is a property of the chart, not a period. The Kaal Sarp calculator tests for it and the explainer sets out what is and is not known about it.

Before and after: the neighbours

A Ketu period is always entered from Mercury Mahadasha, except for those born into it, and always exits into Venus Mahadasha. The joins are worth looking at. The last sub-period of Mercury is Mercury-Saturn and the first of Ketu is Ketu-Ketu; the last of Ketu is Ketu-Mercury and the first of Venus is Venus-Venus, the longest single antardasha in the whole system at three years and four months.

Questions people ask

How long is the Ketu Mahadasha?

Seven years, by BPHS Ch. 46 Sloka 15. With the 365.2425-day year this app uses, that is about 2,557 days. If you were born under Ashwini, Magha or Mula, only the balance left at birth applies, which can be anything from a few days to the full seven years.

Is the Ketu Mahadasha good or bad?

BPHS does not give a single answer. Ch. 47 Sloka 72-77 give favourable results for Ketu in an angle, a trine, the 3rd, 6th or 11th, or in a benefic's sign, and difficult ones for Ketu in the 2nd, 8th or 12th or under a malefic aspect. The house and the sign lord decide which list applies.

Why does this app show my Ketu Mahadasha as neutral or testing when Ketu is well placed?

Because the engine gives Ketu no dignity. Its favourable verdict needs either a strong dignity or the Lagna, and Ketu can only meet the second. In any other house the three-tier quality reads neutral, or challenging in the 6th, 8th or 12th. The special house lists of Ch. 47 Sloka 72-77 are not coded, so apply them by hand from this page.

Does the Ketu Mahadasha mean foreign travel?

Foreign countries and distant journeys recur in the text. Ch. 47 lists gain from foreign countries among the favourable results and journeys to distant places in the last part of the period. These are conditional statements in an old idiom, not a forecast of relocation.

I was born in the Ketu Mahadasha. Does it matter if I was a child?

The period is the same arithmetic at any age. The texts in this corpus give no separate reading for a childhood dasha, and their results are phrased for an adult householder, so most of the wording cannot be applied literally. What the birth dasha does fix is the timetable of every later period.

Do I need my birth time to find my Ketu Mahadasha?

The calculator runs on a date alone, but the result is only as firm as the Moon's position. Without a time the boundaries can shift by months, and the house Ketu occupies, on which nearly every classical condition depends, cannot be known at all.