Sri Lankan (Jaffna) vs Indian Tamil Porutham: Key Differences

Vakiya vs Thirukanitha panchangam calculations

The first practical difference is how the birth chart itself is calculated. Many traditional Jaffna Tamil astrologers (particularly those using the Kokuvil or Tirunelveli almanacs) and traditional temple lineages in Tamil Nadu cast charts using the Vakiya (sentence-based tabular) panchangam. Modern software tools and many contemporary Indian and diaspora astrologers use the Drik Ganitha or Thirukanitha (astronomical observation-based Lahiri sidereal) method.

For most births, both systems place the Moon in the same nakshatra and Rasi. However, when a birth occurs close to a nakshatra, pada or Lagna boundary—or near a planetary sign change for Mars, Rahu, Ketu or Saturn—the slight ayanamsa and tabular difference between Vakiya and Thirukanitha can shift a star pada or house position. Pairutham calculates charts using Lahiri sidereal astronomy (Thirukanitha) and displays the exact degrees so you can immediately spot a boundary case when comparing a handwritten Vakiya jathagam.

10 poruthams vs 20 poruthams and the five core checks

In everyday family conversations, both Indian and Sri Lankan Tamil families talk about the ten poruthams (Dasa Porutham): Dinam, Ganam, Mahendram, Stree Deergham, Yoni, Rasi, Rasi Athipathi, Vasiyam, Rajju and Vedhai. In formal Jaffna manuals, astrologers also reference an expanded twenty-porutham list that includes additional checks such as Nadi, Vriksham (Maram / tree), Pakshi (bird), Bhutham (element), Ayul and Jathi.

Despite the longer academic list, both traditions converge on the same core screen first: Rajju and Vedhai as primary table checks, alongside Dinam, Ganam, Yoni, Rasi and Rasi Athipathi. In Pairutham’s full report, the ten Tamil poruthams and the eight Ashtakoota kootas (which include Nadi and Varna) are presented side by side so families from either background can inspect the exact components they care about.

Read the guide to Rajju and Vedhai tables

Pava Porutham: Mars, Rahu-Ketu and Saturn house checks

A notable hallmark of Jaffna Tamil jathagam matching—especially among families in Toronto, London and Sydney—is the emphasis placed on Graha Dosham and Pava Porutham (planetary house balance) alongside star porutham. While many online tools only check nakshatra compatibility, Sri Lankan Tamil astrologers routinely inspect the whole-sign house placements of Mars (Chevvai), Rahu, Ketu, Saturn (Sani) and the Sun from the Lagna, Moon and Venus.

In particular, Jaffna and South Indian astrologers pay close attention to Mars placements (Chevvai Dosham in houses 2, 4, 7, 8 or 12, and sometimes 1) as well as Rahu-Ketu placement in the 1st/7th or 2nd/8th axis (often discussed as Naga or Sarpa placement). Rather than treating these placements as automatic rejections, traditional astrologers compare both charts to see whether similar planetary weights balance each other across the pair.

Dasha Sandhi and current planetary periods

Another point that frequently surfaces in Sri Lankan and conservative South Indian consultations is Dasha Porutham or Dasha Sandhi—checking that the two partners’ Vimshottari Mahadasha transitions do not overlap at critical junctions right after the wedding, and reviewing whether either chart is in an intense Saturn transit (Ezhara Sani / Sade Sati).

Pairutham’s full report includes each partner’s complete Vimshottari Dasha and Antardasha timeline as well as their current and upcoming Sade Sati windows. Having those dates printed in plain English helps couples and parents hold a calm, factual conversation with a family astrologer instead of relying on rumour.

Bridge both traditions in one English report

Use Pairutham’s free snapshot to check the birth stars and overall score, and read the main ten-porutham guide to see how every check is graded.

Read the main guide to ten poruthams

Questions families ask

Why does my Jaffna handwritten jathagam show a different pada from online tools?

Handwritten Jaffna charts are often cast using the Vakiya panchangam, while online calculators (including Pairutham) use the astronomical Thirukanitha (Lahiri sidereal) method. When the Moon is within a degree of a nakshatra or pada boundary, the two almanacs can assign adjacent padas.

Do Sri Lankan and Indian Tamils use the same 10 poruthams?

Yes. The core ten poruthams—Dinam, Ganam, Mahendram, Stree Deergham, Yoni, Rasi, Rasi Athipathi, Vasiyam, Rajju and Vedhai—are shared across both traditions, even when a Jaffna astrologer also checks Nadi, Maram, Pakshi or planetary Pava balance.

How does Pairutham help diaspora families compare both styles?

Pairutham shows both Sanskrit and Tamil star names, all ten Tamil poruthams, the 36-point Ashtakoota breakdown (including Nadi), Mars houses from Lagna, Moon and Venus, full nine-planet positions (including Rahu and Ketu) and Dasha timelines in plain English.

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