A dekka (Greek) or a DreshKamsa (ancient sanskrit) or a dreshkana (drekkana – modern sanskrit) literally means seeing corners (or visualizing trines).
राशित्रिभागाद्रेष्काणास्ते च षट्त्रिंशदीरिताः । परिवृत्तित्रयं तेषां मेषादेः क्रमशो भवेत् ॥ ७॥ स्वपञ्चनवमानां च राशीनां क्रमशश्च ते । नारदाऽगस्तिदुर्वासा द्रेष्काणेशाश्चरादिषु ॥ ८॥ (Chapter 6, verses 7 and 8- Brihat Parasara Hora Sastra )
Translation: One third of a Zodiac Sign is called Drekkana. These are in total 36, counted from Aries (to Pisces), repeating thrice at the rate of 12 per round. The 1st, 5th, and the 9th signs from a zodiac sign are its three parts, and are respectively lorded by Narada, Agasthya, and Doorvasa (Sages in Vedic culture)
There are multiple interpretations and methods of construction of the D3 Drekkana Chart, including an ancient method similar to Navamsa D9, a modern (Elements) method, and variations in Western astrology (based on Ptolemy), Tajjika in the Middle East, the Chinese 36 decans, and the Japanese decans.
Each method corresponds to a unique analysis of the birth chart such as looking into life of co-borns or siblings, a person’s mental and emotional state, 3rd house significations and many more.
| D1 Sign | D1 Degrees | D3 Sign (Ancient Method) | D3 Sign (Modern Method) | Lord |
| Aries | 0° to 9°59” | Aries | Aries | Narad |
| Aries | 10° to 19°59” | Taurus | Leo | Agastya |
| Aries | 20° to 29°59” | Gemini | Sagittarius | Durvasa |
| Taurus | 0° to 9°59” | Cancer | Taurus | Narad |
| Taurus | 10° to 19°59” | Leo | Virgo | Agastya |
| Taurus | 20° to 29°59” | Virgo | Capricorn | Durvasa |
| Gemini | 0° to 9°59” | Libra | Gemini | Narad |
| Gemini | 10° to 19°59” | Scorpio | Libra | Agastya |
| Gemini | 20° to 29°59” | Sagittarius | Aquarius | Durvasa |
| Cancer | 0° to 9°59” | Capricorn | Cancer | Narad |
| Cancer | 10° to 19°59” | Aquarius | Scorpio | Agastya |
| Cancer | 20° to 29°59” | Pisces | Pisces | Durvasa |
| Leo | 0° to 9°59” | Aries | Aries | Narad |
| Leo | 10° to 19°59” | Taurus | Leo | Agastya |
| Leo | 20° to 29°59” | Gemini | Sagittarius | Durvasa |
| Virgo | 0° to 9°59” | Cancer | Taurus | Narad |
| Virgo | 10° to 19°59” | Leo | Virgo | Agastya |
| Virgo | 20° to 29°59” | Virgo | Capricorn | Durvasa |
| Libra | 0° to 9°59” | Libra | Gemini | Narad |
| Libra | 10° to 19°59” | Scorpio | Libra | Agastya |
| Libra | 20° to 29°59” | Sagittarius | Aquarius | Durvasa |
| Scorpio | 0° to 9°59” | Capricorn | Cancer | Narad |
| Scorpio | 10° to 19°59” | Aquarius | Scorpio | Agastya |
| Scorpio | 20° to 29°59” | Pisces | Pisces | Durvasa |
| Sagittarius | 0° to 9°59” | Aries | Aries | Narad |
| Sagittarius | 10° to 19°59” | Taurus | Leo | Agastya |
| Sagittarius | 20° to 29°59” | Gemini | Sagittarius | Durvasa |
| Capricorn | 0° to 9°59” | Cancer | Taurus | Narad |
| Capricorn | 10° to 19°59” | Leo | Virgo | Agastya |
| Capricorn | 20° to 29°59” | Virgo | Capricorn | Durvasa |
| Aquarius | 0° to 9°59” | Libra | Gemini | Narad |
| Aquarius | 10° to 19°59” | Scorpio | Libra | Agastya |
| Aquarius | 20° to 29°59” | Sagittarius | Aquarius | Durvasa |
| Pisces | 0° to 9°59” | Capricorn | Cancer | Narad |
| Pisces | 10° to 19°59” | Aquarius | Scorpio | Agastya |
| Pisces | 20° to 29°59” | Pisces | Pisces | Durvasa |