Swati nakshatra: Rahu's star in Libra, what the texts say and how to check yours

Swati is the fifteenth nakshatra, a 13°20' stretch of Libra ruled by Rahu in the Vimshottari scheme. If the Moon stood there when you were born, Swati is your Janma Nakshatra, the star this app uses to start your dasha sequence, to match charts and to grade days for an undertaking. This page collects what the classical books in this app's library actually say about Swati, chapter and page given, and every number on it comes from running the app's own engine, not from a table copied elsewhere.

It is one page in a series on all 27 nakshatras, each laid out the same way: where the star sits, what the texts say, its padas, its dasha links, its use in matching and muhurat, how to check it, and the misreadings to avoid. Swati's neighbours are Chitra, which ends at Libra 6°40', and Vishakha, which begins at Libra 20°00'. The sign it lives in is described on the Libra (Tula) page. The method behind every figure is on the methodology page, and the books are listed on the sources page.

Where Swati sits: the arc, the padas and the engine's facts

Swati is the 15th of the 27 nakshatras. Each nakshatra is 13°20' of the sidereal zodiac, 360 degrees divided by 27, and this app measures them from 0° Aries in the Lahiri (Chitrapaksha) frame. So Swati runs from Libra 6°40' to Libra 20°00', wholly inside Libra. A planet is "in Swati" when its sidereal longitude falls inside that arc. When someone says "my nakshatra is Swati", they mean the Moon was there at birth: the Janma Nakshatra. The Moon moves about 13 degrees a day, so it crosses a nakshatra boundary inside most birth dates, and the nakshatra calculator reports the star at both ends of the birth date when no time is given. The difference between a rashi and a nakshatra is set out separately, as is why two apps can name two different stars for the same birth.

Swati is one of the few nakshatras that sits entirely inside one sign and touches neither of its edges: it begins 6°40' into Libra and ends two-thirds of the way through it. A Moon in Swati is therefore always a Libra Moon, so the Moon sign and the star never disagree about which sign lord colours the reading. Libra is Venus's sign; the star's Vimshottari lord is Rahu. A Swati Moon thus has two rulers in play at once, Venus for the sign and Rahu for the star, and the engine reports both.

Inside the star the engine draws nine unequal sub-divisions, one for each Vimshottari lord, each as wide as that lord's share of the 120-year cycle, and the first belongs to Swati's own lord, Rahu. These sub-lords matter most for points that move fast through the sky, above all the Ascendant, which is why the sub-lord needs a birth time to the minute. The sub-lord calculator prints this same table for your own Moon:

What the classical texts say about Swati

Three books in this app's library speak about Swati directly. Jyotisha-Siddhanta-Sara (Rama R. Rao, 1994) gives every nakshatra a description in Ch. IV; the corpus copy is a scan with no text layer, so the pages cited below were read as images. Brihat Parashara Hora Shastra (BPHS) uses Swati as a counting point and a member of groups rather than describing it. Saravali names Swati once, in a Raja Yoga, and the modern case-study book Advanced Predictive Astrology uses it as its example of a Moon and Ascendant sharing one star. The readings are reported as the texts give them, with the same omissions the engine makes: the caste label each nakshatra carries in Jyotisha-Siddhanta-Sara is not repeated, nor are its predictions about appearance and marriage.

Jyotisha-Siddhanta-Sara, Ch. IV (pp. 87-103)

Entry 15 of the chapter, spelt Swaathi, describes the star as "red like kumkum, consisting of a single star", with Vayu as its presiding deity. It lists the people "born in this constellation" by occupation, servants, merchants, boatmen, reporters, messengers, charioteers, mariners, dancers and skilled tradesmen, says they "will have weak friendships and are temperate in habits", and associates the star with birds, deer, grains and beans. Read as the book frames it, this is a list of what the star signifies, the kind of list a horary or mundane reading would draw on, not a career forecast for everyone with a Swati Moon.

The entry then gives two separate readings of a Swati birth. The first, in prose, says the person "will be of a mild and quiet nature, will control his passion, will be skilled in trade, will be merciful, of sweet speech and disposed to do acts of charity". The second is a Sanskrit sloka with the book's own translation: an attractive appearance, "very intelligent", with "many attainments to his credit". The engine's one-line reading for Swati comes from that sloka; its comment says appearance and marriage predictions were dropped, which is why the sloka's remark about popularity with women does not appear in the app.

Two qualifications in the same chapter govern how far any of this applies. Page 92 introduces the readings as "the characteristics of those born when Chandra transits the various nakshatras", and adds: "The effects will fully come to pass only if the moon is powerful." And page 91 ties the star to time as well as temperament: "During the period of a planet situated in a particular star, effects will be felt according to the above characteristics." Swati's characteristic in that list is movable, so the book expects a planet placed in Swati to express itself through movement and change while its period runs.

Page 89 uses Swati in its own worked example of the tattva rule. Swati is a Tejo (fire) star; Venus is given Jala (water). The book says that when the 7th lord Venus sits in Swati the two elements conflict and the native's chances of conjugal happiness suffer, its general rule being that a planet and star of the same tattva give unmodified effects while dissimilar ones modify them. That is a rule about a planet in Swati, not about a Swati Moon, and the app does not apply it.

BPHS: Swati as a deity, a count and a group

BPHS does not describe Swati as a temperament. It names it, in Santhanam's list after Ch. 3 Sl. 6, as the fifteenth of the 27, and its deity appears in Ch. 6 Sl. 24-26, where the lords of the 27 Saptavimshamsa divisions are "the presiding deities of the 27 Nakshatras": the fifteenth is Marut. Jyotisha-Siddhanta-Sara names Vayu. Both are names for the wind, and the second book's own vocabulary uses Vayu for the air element, so the two lists agree in substance while differing in the word.

Swati's larger role in BPHS is as a counting point. Ch. 46 Sl. 35-36 sets out Chaturashiti-sama Dasha, "appropriate in cases, where the Karm's Lord is placed in Karm", that is, the 10th lord in the 10th house: "Count from Swati to the Janm Nakshatr and divide this number by 7." So for every Moon, in every chart where that condition holds, this system measures from Swati. A Moon in Swati itself counts 1, which gives the first lord in the sequence, the Sun, for 12 years; the engine returns the same.

Two more groupings in the same chapter place Swati. Shastihayani Dasha (Sl. 40-41), used where the Sun is in the Lagna, gives Swati with Vishakha and Anuradha to Budh (Mercury), 6 years. Kalachakra (Sl. 56-58) writes Hast, Chitra and Swati into the Savya chakra and then lists Swati among the ten stars whose padas "should be reckoned in the same manner, as the Padas of Ashvini". The pada table below takes its Deha and Jiva columns from that rule.

BPHS also names three Gandanta junctions in Ch. 92 Sl. 3, at the ends of Revati, Ashlesha and Jyeshtha. Swati is not one of them; its boundaries fall inside Libra, nowhere near the sign edges where those junctions sit. That matters for the misreadings below. For the Moon in Libra more broadly, see the Moon in Vedic astrology page.

Saravali and Advanced Predictive Astrology

Saravali mentions Swati once. Ch. 35, on Raja Yogas, Sl. 148: "If Venus is in the Ascendant, one becomes a ruler, provided the planet in question simultaneously occupies one of the asterisms, viz. Krittika, Revati, Swati, Pushyami and Aswini." Venus in Swati in the Ascendant means a Libra Ascendant with Venus between 6°40' and 20°00' of its own sign. It is a condition on Venus's star, not on the Moon's, and like every Raja Yoga line in that chapter it describes a combination rather than promising an outcome.

Advanced Predictive Astrology (Vol. II, pp. 83-84), in a chapter on the mind, uses Swati as its example of the Ascendant and the Moon "in the same constellation ruled by the same planet, e.g., Swati ruled by Rahu in the sign of Libra". The author reads that double emphasis as a mind that "dwells excessively on the sensual things", and follows it with advice to take precautions. It is one modern writer's reading of a specific double placement, Ascendant and Moon both in Swati, and the book offers it without a classical citation.

Where the sources disagree

The deity differs in name only, Marut in BPHS and Vayu in Jyotisha-Siddhanta-Sara. The two readings inside Jyotisha-Siddhanta-Sara itself pull in slightly different directions: the prose stresses restraint, trade and mildness; the sloka stresses attractiveness, intelligence and attainment. Neither contradicts the other, and the engine carries only the sloka. On direction the book is consistent, south-west in both the list on p. 90 and the entry on p. 102.

The engine's Gana for Swati, Deva, has no book behind it in this library, as its own header says. The Nadi grouping has the partial anchor described under compatibility. Nothing in the texts here addresses whether Swati is good or bad for marriage timing; the engine's muhurat list puts it on the Marriage list and nowhere else, and that choice is the code's, not a cited rule.

The four padas of Swati

Each nakshatra splits into four padas of 3°20', and each pada is one navamsa, so the 108 padas of the zodiac walk through the twelve signs nine times. BPHS Ch. 46 Sl. 87-88 gives the rule as arithmetic: take the number of nakshatras already passed, divide by 3, multiply the remainder by 4, add the pada, and count that many signs from Aries. For Swati's first pada: 14 nakshatras have passed, 14 divided by 3 leaves 2, times 4 is 8, plus 1 is 9, and the 9th sign from Aries is Sagittarius. The engine's computeNavamsa, which uses the sign-based rule from Jyotisha-Siddhanta-Sara Ch. II, returns Sagittarius too. The Navamsa calculator shows the whole D9 chart, and the Navamsa article explains why it needs an accurate birth time.

All four padas lie in Libra, so the Moon's sign does not change across the star, but its navamsa moves through Sagittarius, Capricorn, Aquarius and Pisces. None of the four is vargottama, because Libra's own navamsa falls in the Chitra padas just before Swati. A Swati Moon therefore always sits in a different sign in the D9 than in the birth chart, and the D9 dispositor of the Moon is Jupiter in the first and fourth padas and Saturn in the second and third.

Jyotisha-Siddhanta-Sara's durithamsa rule applies here: as a Laya star, Swati's 3rd and 4th padas, Libra 13°20' to 20°00', are the ones it says are "believed to be unfavourable". The book gives no further detail or reason, and the app does not use the rule. It is reported because a reader may meet it elsewhere and wonder where it comes from.

Swati and the dasha sequence

BPHS Ch. 46 Sl. 12-14 finds the first Vimshottari dasha by counting from Krittika to the birth star and dividing by nine; the remainder picks a lord from the sequence Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, Ketu, Venus. Counting Krittika as 1, Swati is 13; 13 divided by 9 leaves 4, and that is Rahu. The engine reaches the same lord from its own table. Sl. 15 gives Rahu 18 years. A Moon in Swati therefore starts life in a Rahu Mahadasha, and Sl. 16 says how much of it remains: the part of the nakshatra the Moon has still to cross, as a share of the whole, times 18 years.

Run on a sample birth of 1 January 2000 with the Moon a quarter of the way into Swati, the engine leaves three quarters of the Rahu period, 13.5 years, and dates the next periods from there:

What a Rahu period is classically held to bring is on the Rahu Mahadasha page and the Rahu in Vedic astrology page; the Vimshottari dasha calculator gives your own dates, and the sub-periods article explains why those dates move when the birth time moves. For Rahu as a graha in Libra, see the Rahu page itself.

Ashtottari is the 108-year system BPHS Ch. 46 Sl. 17-20 offers as an alternative "when Rahu is not in Lagn, in any other Kendr, or Trikon to the Lord of the Lagn". It assigns stars in alternating runs of four and three from Ardra. Swati falls in Mars's run of four, Hasta, Chitra, Swati and Vishakha, so a Swati Moon starts in a Mars period of 8 years. Under Sl. 21-22 a malefic's period is shared out a quarter per star, so Swati, third of Mars's four, carries the third two-year quarter: at the very start of Swati four years of Mars are taken as already over, the same arithmetic Jyotisha-Siddhanta-Sara (p. 121) works through for Aslesha. Jyotisha-Siddhanta-Sara Ch. V (p. 120) prints the same grouping as a table. The app computes Ashtottari this way, with the balance and every period dated, on the Alternate Dashas calculator and the Kundali screen.

The engine does compute six other nakshatra-based systems from the same chapter, each with its own starting star and condition. For a Moon in Swati (sampled at the middle of the star) the alternate dashas calculator returns:

Chaturashiti-sama is the line to notice for Swati. It is the only system in the table that counts from Swati itself, so when its condition holds, the 10th lord in the 10th house, every Moon's first lord in it depends on how far that Moon's star lies from Swati. For a Swati Moon the count is 1 and the first lord is the Sun.

Swati in compatibility and muhurat

Ashtakoot matching, the 36-point Guna Milan the match tool runs, reads four of its eight kootas from the two Moon nakshatras: Tara, Yoni, Gana and Nadi. The engine places Swati in the Deva gana, the Antya nadi and the Buffalo yoni. Its own header is candid that none of the classical books it works from contains the Ashtakoot rules, no nakshatra gana list and no koota point scale, so these tables are carried as they are rather than cited. One partial anchor exists: Advanced Predictive Astrology (p. 225) prints "Humour Producing Asterisms" in three groups of nine, Vata, Pitta and Kapha, and that grouping coincides star for star with the engine's Aadi, Madhya and Antya nadis. Swati sits in its Kapha group. The book does not call this Nadi koota, and this page does not claim it does.

Two people with the Moon in Swati score 28 of 36 in the engine: full marks on seven kootas and 0 of 8 on Nadi, because the same star always means the same nadi. The other stars sharing Swati's Antya nadi, and so also scoring 0 on Nadi against it, are Krittika, Rohini, Ashlesha, Magha, Vishakha, Uttara Ashadha, Shravana, Revati. On Yoni, Hasta shares the Buffalo and scores the full 4; the engine treats the Horse as the Buffalo's enemy, so Ashwini and Shatabhisha score 0; every other pairing scores 2.

Tara counts from each partner's star to the other's. The engine marks a count as unfavourable when it leaves 3, 5 or 7 after division by 9, and BPHS Ch. 44 Sl. 15-21 does name the 3rd, 5th and 7th stars from the birth star Vipat, Pratyak and Vadh, though in a chapter on longevity this page does not reproduce. Counted forward from Swati, the unfavourable stars are Ashwini (14), Krittika (16), Pushya (21), Magha (23), Uttara Phalguni (25), Anuradha (3), Mula (5), Uttara Ashadha (7), Uttara Bhadrapada (12). The score is 3 when both directions are clear, 1.5 when one is, and 0 when neither is. The compatibility feature shows every koota with its points, so a low total can be traced to the factor behind it.

For choosing a time, the muhurat feature and the muhurat calculator add 16 points to a window when the transiting Moon is in a star on the activity's list and take 6 away when it is not. Swati is on the Marriage list. Jyotisha-Siddhanta-Sara classes Swati as movable, along with Hasta, Shravana, Dhanishta and Shatabhisha, but the engine's Travel list includes Hasta, Shravana and Dhanishta and leaves Swati and Shatabhisha out; the book itself does not say what the movable class is to be used for, so this is recorded as a difference rather than a contradiction. Jyotisha-Siddhanta-Sara (p. 89) also calls the 22nd star from one's birth star the vainasika nakshatra, "to be avoided for auspicious events"; for a Swati native that is Ashlesha. The engine does not apply that rule.

Checking Swati in your own chart

1. 1.Open the nakshatra calculator with your birth date and, if you have it, time and place. It returns the Moon's star, its pada and its lord. Without a time it also shows the star at 00:00 and 23:59, so you can see whether Swati held all day.
2. 2.Check the pada against the table above. The pada fixes the Moon's navamsa, which the Navamsa calculator shows in full.
3. 3.If your Moon is within a few arc-minutes of a sub-lord boundary, the sub-lord calculator prints the distance to the next one. An error of a few minutes in the birth time can move it.
4. 4.Open the Vimshottari dasha calculator to see the Rahu balance at birth and every period after it.
5. 5.Look at the whole chart in the birth chart calculator. A star describes the Moon's placement; the houses, the Ascendant and the other planets are read from the full chart.
6. 6.For matching, enter both birth details in the match tool; it computes both stars itself, so nothing has to be typed in by name.

If your Moon is in Swati and you want the reading in context, the kundali feature shows the star alongside the full chart, and the unknown birth time article explains what can and cannot be known without a time. Swati is wide enough that a time error rarely moves the Moon out of it, but the pada and sub-lord can change.

Common misreadings of Swati

• Swati is not a Gandanta star. BPHS Ch. 92 Sl. 3 places the Nakshatra Gandanta junctions at the Revati-Ashvini, Ashlesha-Magha and Jyeshtha-Mula boundaries, and Swati touches none of them.
• "Swati is ruled by Venus" mixes two lords. Venus rules Libra, the sign; Rahu rules Swati in the Vimshottari scheme. Both matter, for different things: the sign lord for the Moon sign reading, the star lord for the dasha.
• The occupations in Jyotisha-Siddhanta-Sara, boatmen, messengers, dancers and the rest, are significations of the star, not a list of careers a Swati native will follow. The book itself prefaces its personal readings with the condition that the Moon be powerful.
• Being on the engine's Marriage list does not make every Swati day a good day for a wedding. The muhurat score adds the nakshatra's 16 points to several other factors, Moon house, tithi, paksha, weekday, Rahu Kaal and a personal number, and any of them can outweigh it.
• Rahu as star lord does not make Swati "malefic". The texts quoted here describe a Swati birth in largely favourable terms, and the Rahu link decides the dasha order, not the temperament.

Questions about Swati

Which sign is Swati nakshatra in?

Libra, entirely: from Libra 6°40' to Libra 20°00' in the sidereal zodiac the engine uses. A Moon in Swati is always a Libra Moon.

Who is the lord of Swati?

Rahu, in the Vimshottari scheme, with a period of 18 years. The deity is a different thing: BPHS Ch. 6 names Marut and Jyotisha-Siddhanta-Sara names Vayu. For what a Rahu period is held to bring, see the Rahu Mahadasha page.

What are the four padas of Swati?

Libra 6°40'-10°00' (navamsa Sagittarius), 10°00'-13°20' (Capricorn), 13°20'-16°40' (Aquarius) and 16°40'-20°00' (Pisces). None is vargottama.

What gana, nadi and yoni does the app give Swati?

Deva gana, Antya nadi and the Buffalo yoni. The engine carries these as standard Ashtakoot tables; its own header notes that no classical book in this library lists them.

Can two Swati natives marry, according to the match tool?

The engine scores two Swati Moons 28 of 36: full marks on seven kootas and 0 on Nadi, because the same star always shares a nadi. The tool shows each koota separately, so the reason for the shortfall is visible.

Is Swati good for starting a journey?

The engine's Travel list does not include Swati, so a travel window with the Moon there loses 6 points rather than gaining 16. Jyotisha-Siddhanta-Sara calls Swati movable, but does not tie that class to travel.

Why does the app show a short trait line for Swati and not more?

The line is the engine's paraphrase of the Jyotisha-Siddhanta-Sara sloka. The book's longer description includes caste, appearance and marriage material the app deliberately leaves out, and the book itself says the effects are full only when the Moon is strong.

My Moon is at Libra 6°45'. Am I really Swati?

Yes, by 5 arc-minutes, about ten minutes of the Moon's motion. That margin is inside the uncertainty of many recorded birth times, and inside the difference between ayanamsas, so another app may say Chitra. The nakshatra calculator shows the exact longitude.