Rajju dosha calculator

Check two birth nakshatras for Rajju and Vedha porutham. Choose each person’s nakshatra, or find it from the date of birth or the first syllable of the name; the calculator gives each rajju (Pada, Kati, Nabhi, Kantha or Shiro), whether both fall in the same rajju, and whether the two stars form a vedha pair.

What the five rajjus are

South Indian marriage matching compares two horoscopes through ten poruthams (agreements). In Rajju porutham the 27 nakshatras are divided into five rajjus, each named after a part of the body. Counting from Ashwini, the rajjus run Pada, Kati, Nabhi, Kantha, Shiro and back down Kantha, Nabhi, Kati, Pada; the nine-star pattern repeats three times, so Shiro holds three nakshatras and each of the other rajjus six.

• Pada rajju (feet): Ashwini, Ashlesha, Magha, Jyeshtha, Mula, Revati.
• Kati rajju (waist), also called Ooru (thigh): Bharani, Pushya, Purva Phalguni, Anuradha, Purva Ashadha, Uttara Bhadrapada.
• Nabhi rajju (navel), also called Udara (belly): Krittika, Punarvasu, Uttara Phalguni, Vishakha, Uttara Ashadha, Purva Bhadrapada.
• Kantha rajju (neck): Rohini, Ardra, Hasta, Swati, Shravana, Shatabhisha.
• Shiro rajju (head): Mrigashira, Chitra, Dhanishta.

The rajju rule

• Different rajjus: the Rajju porutham agrees, and there is no rajju dosha.
• The same rajju: the Rajju porutham does not agree, and the pair is said to have rajju dosha.

For example, Ashwini and Magha are both in Pada rajju, so that pair has rajju dosha by the rule. Ashwini (Pada) and Bharani (Kati) are in different rajjus, so that pair has none. The rajju depends on the nakshatra alone; the rashi and the pada do not change it.

Vedha pairs

Vedha porutham names pairs of nakshatras that are said to obstruct each other. A couple whose two birth stars form a vedha pair does not agree in Vedha porutham. The twelve pairs outside Shiro rajju appear in every list checked, and every list that gives the Shiro stars a vedha star pairs Mrigashira with Dhanishta:

• Ashwini and Jyeshtha
• Bharani and Anuradha
• Krittika and Vishakha
• Rohini and Swati
• Mrigashira and Dhanishta
• Ardra and Shravana
• Punarvasu and Uttara Ashadha
• Pushya and Purva Ashadha
• Ashlesha and Mula
• Magha and Revati
• Purva Phalguni and Uttara Bhadrapada
• Uttara Phalguni and Purva Bhadrapada
• Hasta and Shatabhisha

The lists differ on Chitra: some make Mrigashira–Chitra and Chitra–Dhanishta vedha pairs too (so that Mrigashira, Chitra and Dhanishta are all vedha to one another), while others give Chitra no vedha star, and some shorter lists give none of the three Shiro stars one. The calculator reports those two pairs as “the lists differ”. In this table every vedha pair is also a same-rajju pair; for example Ashwini and Jyeshtha are both Pada rajju.

How the calculator finds each nakshatra

1. Birth nakshatra. If the family horoscope or a temple record names the janma nakshatra, choose it directly. This is the most reliable input.
2. Date of birth. The date, time and UTC offset of the birthplace fix the Moon’s sidereal position (Lahiri ayanamsa), worked out in your browser, and every 13°20′ of it is one nakshatra. Without a time the tool uses the Moon at noon, names every star the Moon passes through that day, and says when one of them would change the answer. The same calculation powers the nakshatra calculator by date of birth.
3. Name. The first syllable of the name is looked up in the traditional table of naming syllables (as in the nakshatra by name tool). This gives the name nakshatra, which matches the birth star only when the name was chosen from it, so it is an approximation.

About exceptions

Texts and family traditions describe further distinctions within a rajju and situations in which a same-rajju or vedha pair is read differently, and they do not agree on them. This calculator states the basic rules only. It does not apply any exception, does not mark a dosha as cancelled and does not predict anything about a marriage. Those questions belong to an astrologer reading the two complete birth charts.

Related tools and guides

• Nadi dosha calculator: the nadi of two nakshatras and the same-nadi rule.
• Nakshatra gana calculator: the gana, yoni animal and nadi of a birth star.
• Kundali matching by date of birth: all eight kootas from two birth dates.
• Gun milan by name: all eight kootas from two names.
• Nakshatra and pada calculator: find a birth star from the date and time.
• List of 27 nakshatras and the 27 nakshatras explained.