Synastry / Compatibility Calculator

Compare two birth charts: every planetary aspect between the two people, with a harmony summary

Dear user, this tool is completely for educational and mathematical purposes only. You should not take any real-life decisions based on these numbers or calculations. Especially in relationship matters — trust and love can never be represented by numbers.

Person A

Offset is auto-filled from the city (Sri Lanka historical changes handled). For other countries, adjust for daylight-saving time if it applied at that date.

Person B

Offset is auto-filled from the city (Sri Lanka historical changes handled). For other countries, adjust for daylight-saving time if it applied at that date.

Harmony indicator (a rough guide only)
045 / 100100

33 inter-chart aspects found. See the traditional 20-porondam check below.

Inter-chart aspects (A → B)
A MercuryB MoonSquare · Orb 0.1°
A VenusB UranusTrine · Orb 0.1°
A MarsB SunConjunction · Orb 0.3°
A MarsB MoonConjunction · Orb 0.3°
A MercuryB SunSquare · Orb 0.4°
A MoonB SaturnSquare · Orb 0.6°
A JupiterB SunSquare · Orb 0.8°
A PlutoB NeptuneSextile · Orb 1.0°
A JupiterB MoonSquare · Orb 1.3°
A VenusB MercurySquare · Orb 1.5°
A MoonB VenusSquare · Orb 1.9°
A MarsB MarsSextile · Orb 2.0°
A JupiterB MercurySquare · Orb 2.0°
A UranusB NeptuneConjunction · Orb 2.3°
A VenusB PlutoOpposition · Orb 2.4°
A NeptuneB NeptuneConjunction · Orb 2.6°
A MarsB MercuryConjunction · Orb 3.0°
A UranusB PlutoSextile · Orb 3.1°
A MercuryB MercurySquare · Orb 3.2°
A SaturnB NeptuneSextile · Orb 3.2°
A JupiterB UranusSextile · Orb 3.4°
A SunB SaturnSextile · Orb 4.0°
A MercuryB JupiterTrine · Orb 4.1°
A VenusB SunSquare · Orb 4.3°
A PlutoB PlutoConjunction · Orb 4.4°
A MercuryB UranusTrine · Orb 4.6°
A VenusB MoonSquare · Orb 4.8°
A SunB VenusTrine · Orb 5.2°
A NeptuneB SaturnSquare · Orb 5.4°
A UranusB UranusConjunction · Orb 5.6°
A JupiterB PlutoConjunction · Orb 5.9°
A MercuryB PlutoOpposition · Orb 7.1°
A MoonB NeptuneConjunction · Orb 7.4°

Sri Lankan 20-Porondam Check

13.5 / 20

Moderate match — deeper review advised

Groom: Purva Ashadha (Sagittarius moon) · Bride: Purva Phalguni (Leo moon)

1. Dina count bride→groom = 10, tara 1
2. Gana Manushya + Manushya
3. Mahendra count bride→groom = 10
4. Stri Dirgha distance = 10 (needs > 13)
5. Yoni Monkey + Rat
6. Rashi Sagittarius + Leo
7. Rashyadhipati Jupiter + Sun
8. Vashya Sagittarius + Leo
9. Rajju Kati (waist) + Kati (waist)
10. Vedha Purva Ashadha + Purva Phalguni
11. Varna Sagittarius + Leo
12. Linga male + male signs
13. Gotra Pulaha + Atri
14. Pakshi Cock + Owl
15. Bhuta Fire + Fire
16. Nadi Madhya + Madhya
17. Nakath count groom→bride = 19, tara 1
18. Wruksha different birth stars / trees
19. Ayusha taras 1 & 1 (7 = vadha)
20. Graha (papa balance) groom 1 vs bride 4 papa points

Note: rules for a few porondam vary slightly between almanac traditions. Nadi and rajju doshas are weighted heavily in practice — consult an astrologer before any final decision.

What synastry compares

Synastry overlays two birth charts and examines the angles (aspects) between one person's planets and the other's: trines and sextiles read as easy connections, squares and oppositions as friction, conjunctions as intense blending. Below the Western analysis, this page also runs the Sri Lankan විසි පොරොන්දම් — the traditional 20 porondam checks (dina, gana, mahendra, yoni, rajju, nadi and the rest) computed from the couple's sidereal moon nakshatras and rashis, with papa-point balancing for the graha porondama. Traditionally 14 or more matches out of 20 indicate a good pairing, with nadi and rajju treated as the most serious doshas. Rules for a few checks vary between almanac schools, so use this as an educational guide.

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Disclaimer: These tools are for educational purposes only. Although the calculations are performed carefully using established astronomical algorithms, 100% accuracy is not guaranteed. For horoscopes, auspicious times, or important life decisions, please consult a professional astrologer.