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The Tamil calendar, known as the Tamil Panchangam, is one of the oldest continuously used calendar systems in the world. Unlike the North Indian lunisolar calendar, the Tamil calendar is primarily solar-based — months are determined by the Sun's transit through the twelve Rashis (zodiac signs). This solar foundation gives the Tamil calendar a fixed relationship with the Gregorian calendar, making Tamil month dates remarkably consistent from year to year. The Tamil Panchangam is used by over 80 million Tamil-speaking people across Tamil Nadu, Sri Lanka, Malaysia, Singapore, and the global Tamil diaspora.
Each Tamil month begins when the Sun enters a new Rashi. Because the Sun's speed varies slightly through the year (faster near perihelion in January, slower near aphelion in July), Tamil months range from 29 to 32 days. The following table shows each month, its zodiac basis, approximate Gregorian dates, and number of days.
| # | Month | Tamil | Rashi (Zodiac) | Gregorian | Days |
|---|---|---|---|---|---|
| 1 | Chithirai | சித்திரை | Mesha (Aries) | Apr 14 – May 14 | 31 |
| 2 | Vaikasi | வைகாசி | Rishabha (Taurus) | May 15 – Jun 14 | 31 |
| 3 | Aani | ஆனி | Mithuna (Gemini) | Jun 15 – Jul 15 | 31 |
| 4 | Aadi | ஆடி | Kataka (Cancer) | Jul 16 – Aug 16 | 32 |
| 5 | Avani | ஆவணி | Simha (Leo) | Aug 17 – Sep 16 | 31 |
| 6 | Purattasi | புரட்டாசி | Kanya (Virgo) | Sep 17 – Oct 17 | 31 |
| 7 | Aippasi | ஐப்பசி | Tula (Libra) | Oct 18 – Nov 15 | 29 |
| 8 | Karthigai | கார்த்திகை | Vrischika (Scorpio) | Nov 16 – Dec 15 | 30 |
| 9 | Margazhi | மார்கழி | Dhanus (Sagittarius) | Dec 16 – Jan 13 | 29 |
| 10 | Thai | தை | Makara (Capricorn) | Jan 14 – Feb 12 | 30 |
| 11 | Masi | மாசி | Kumbha (Aquarius) | Feb 13 – Mar 13 | 29 |
| 12 | Panguni | பங்குனி | Meena (Pisces) | Mar 14 – Apr 13 | 31 |
Puthandu (Tamil New Year, Chithirai 1st), Chithirai Thiruvizha (Meenakshi Thirukalyanam at Madurai — 10-day temple festival celebrating the divine marriage of Meenakshi and Sundareshwarar)
Vaikasi Visakam (Lord Murugan's birthday — celebrated with grand processions at Palani, Thiruchendur, and all Murugan temples), Agni Nakshatram begins (peak summer heat period)
Aani Thirumanjanam (grand abhishekam of Lord Nataraja at Chidambaram — one of the most important temple events in Tamil Nadu)
Aadi Perukku (18th of Aadi — river festival celebrating monsoon abundance), Aadi Pooram (Andal's incarnation day), Aadi Fridays (Amman worship)
Avani Avittam (sacred thread ceremony renewal for Brahmins — Upakarma), Krishna Jayanthi (Gokulashtami), Vinayakar Chaturthi
Purattasi Saturdays (strict vegetarian observance and Vishnu/Perumal worship for all 4 Saturdays), Navaratri and Vijayadashami (Golu/Kolu display of dolls)
Deepavali (Diwali — celebrated on Amavasya of Aippasi), Skanda Sashti (6-day fast honoring Lord Murugan's victory over Surapadman)
Karthigai Deepam (festival of lights — massive flame lit atop Tiruvannamalai hill, homes lit with rows of oil lamps), Subramanya Sashti
Thiruppavai/Thiruvempavai (30-day dawn devotional singing), Vaikunta Ekadashi (Paramapada Vasal opening at Vishnu temples), Arudra Darshanam (Nataraja's cosmic dance celebration)
Thai Pongal (4-day harvest festival — Bhogi, Surya Pongal, Mattu Pongal, Kaanum Pongal), Thai Poosam (Lord Murugan — Kavadi offerings at Batu Caves and Palani)
Masi Magam (sacred bathing in the sea when Moon is in Magha nakshatra — major event at Mahabalipuram and Pondicherry), Maha Shivaratri
Panguni Uthiram (divine marriages celebrated at major temples — Srirangam, Tirupati, Madurai; associated with Uttara Phalguni nakshatra)
Puthandu, the Tamil New Year, falls on Chithirai 1st (typically April 14th). It marks the Sun's entry into Mesha Rashi (Aries). On this day, families prepare the "Kanni" — an auspicious arrangement of fruits, flowers, gold jewelry, coins, new clothes, raw rice, and a mirror. The first sight upon waking should be the Kanni, symbolizing an auspicious start to the year. A special dish called "Maanga Pachadi" is prepared, combining six flavors (sweet, sour, salty, bitter, pungent, and astringent) representing the six experiences of life. Temples hold special abhishekam ceremonies and recite the new year's Panchangam predictions.
The most fundamental difference between the Tamil and North Indian calendars lies in how months are defined. In the North Indian system (used across UP, Bihar, Rajasthan, MP), months are lunisolar — they run from one New Moon (Amavasya) to the next in the Amanta system, or one Full Moon (Purnima) to the next in the Purnimant system. This means month boundaries shift by about 11 days each year relative to the solar calendar, requiring an intercalary month (Adhika Masa) every ~33 months to resynchronize. The Tamil system avoids this entirely by anchoring months to the Sun's zodiacal transit. When the Sun enters Mesha (Aries), Chithirai begins. When it enters Rishabha (Taurus), Vaikasi begins. This means Tamil dates fall on approximately the same Gregorian dates every year — Chithirai 1 is always April 14th (occasionally 13th or 15th due to axial precession). The Tamil calendar does incorporate lunar elements for determining Tithi, Nakshatra, and festival dates within each solar month, making it a hybrid system — solar for months, lunar for religious observances.
Aadi (mid-July to mid-August) holds a paradoxical position in Tamil culture — it is simultaneously considered inauspicious for worldly activities yet deeply sacred for spiritual practices. No weddings, griha pravesh (housewarming), or major business ventures are initiated during Aadi. The traditional saying "Aadi-la kalyanam, aadhi-la kadesi" (a wedding in Aadi leads to ruin) reflects this deeply held belief. The reasons are both practical and spiritual: Aadi falls during the peak monsoon when floods, illness, and agricultural uncertainty are highest. Spiritually, it is considered a month when the veil between worlds is thin. However, Aadi is also when "Aadi Perukku" (the 18th of Aadi) is celebrated with great enthusiasm along river banks, honoring the swelling of rivers and the fertility of the land. Women perform special pujas near water bodies, offering fruits, flowers, and cooked food. Aadi Fridays are especially sacred — women worship Goddess Amman (Mariamman, Draupadi Amman) with special offerings. "Aadi Pattam" (the Aadi planting season) is when rice cultivation begins in earnest.
Margazhi (mid-December to mid-January) is considered the most spiritually charged month in the Tamil calendar. Krishna declares in the Bhagavad Gita (10.35): "Among months, I am Margashirsha" — the Sanskrit equivalent of Margazhi. This month is when the divine is believed to be most accessible to devotees. The tradition of "Thiruppavai" and "Thiruvempavai" is central to Margazhi — women wake before dawn (typically around 4-5 AM) to sing the 30 verses of Andal's Thiruppavai at Vishnu temples, or Manikkavasagar's Thiruvempavai at Shiva temples. This pre-dawn devotional practice, called "Bhajan" or "Pagal Pattu," continues for all 30 days of Margazhi. The streets of Tamil Nadu come alive with kolam (rangoli) drawn in rice flour before sunrise, and the sound of Nadaswaram and Thavil from temples. Classical music and dance reach their zenith during the Margazhi Season (Chennai Music Season / December Season), the world's largest cultural festival featuring over 3,000 performances across 300+ venues over 6 weeks. Temples perform special Vaikunta Ekadashi celebrations during Margazhi, when the "Paramapada Vasal" (gateway to heaven) is opened at Vishnu temples.