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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.
| # | मास | तमिल | राशि | ग्रेगोरियन | दिन |
|---|---|---|---|---|---|
| 1 | चित्तिरै | சித்திரை | Mesha (Aries) | Apr 14 – May 14 | 31 |
| 2 | वैकासि | வைகாசி | Rishabha (Taurus) | May 15 – Jun 14 | 31 |
| 3 | आनि | ஆனி | Mithuna (Gemini) | Jun 15 – Jul 15 | 31 |
| 4 | आडि | ஆடி | Kataka (Cancer) | Jul 16 – Aug 16 | 32 |
| 5 | आवणि | ஆவணி | Simha (Leo) | Aug 17 – Sep 16 | 31 |
| 6 | पुरट्टासि | புரட்டாசி | Kanya (Virgo) | Sep 17 – Oct 17 | 31 |
| 7 | ऐप्पसि | ஐப்பசி | Tula (Libra) | Oct 18 – Nov 15 | 29 |
| 8 | कार्तिगै | கார்த்திகை | Vrischika (Scorpio) | Nov 16 – Dec 15 | 30 |
| 9 | मार्गळि | மார்கழி | Dhanus (Sagittarius) | Dec 16 – Jan 13 | 29 |
| 10 | तै | தை | Makara (Capricorn) | Jan 14 – Feb 12 | 30 |
| 11 | मासि | மாசி | Kumbha (Aquarius) | Feb 13 – Mar 13 | 29 |
| 12 | पंगुनि | பங்குனி | Meena (Pisces) | Mar 14 – Apr 13 | 31 |
पुथाण्डु (तमिल नव वर्ष), चित्तिरै तिरुविळा (मदुरै मीनाक्षी तिरुकल्याणम्)
वैकासि विशाखम् (भगवान मुरुगन जयन्ती), अग्नि नक्षत्रम् आरम्भ
आनि तिरुमञ्जनम् (चिदम्बरम् में नटराज अभिषेकम्)
आडि पेरुक्कु (नदी उत्सव), आडि पूरम् (आण्डाल अवतार दिवस), आडि शुक्रवार (अम्मन पूजा)
आवणि अवित्तम् (उपकर्म), कृष्ण जयन्ती, विनायकर चतुर्थी
पुरट्टासि शनिवार (विष्णु पूजा), नवरात्रि और विजयादशमी (गोलू/कोलू)
दीपावली, स्कन्द षष्ठी (मुरुगन की विजय का 6-दिवसीय उत्सव)
कार्तिगै दीपम् (तिरुवण्णामलै शिखर पर विशाल ज्योति), सुब्रमण्य षष्ठी
तिरुप्पावै/तिरुवेम्पावै (30 दिन भोर भजन), वैकुण्ठ एकादशी, आरुद्रा दर्शनम्
तै पोंगल (4-दिवसीय फसल उत्सव), तै पूसम् (मुरुगन — कावड़ी)
मासि मगम् (सागर स्नान), महा शिवरात्रि
पंगुनि उत्तिरम् (मन्दिरों में दिव्य विवाह)
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.