Aathan Tamil Calendar Aathan Tamil CalendarThithi, Natchathiram, Nalla Neram and Rahu Kalam for today, plus daily Rasi Palan for all 12 signs, muhurtham dates for marriage and house-warming, and festival reminders. Tamil month dates match the panchangam you keep at home. Every day from 1950 to 2100, in Tamil, English or Tanglish. Free, works offline, no login.
One app, one consistent calculation engine, every day from 1950 to 2100.
Thithi, Natchathiram, Yogam, Karanam with exact start/end times, plus Nalla Neram, Rahu Kalam, Yamagandam, Kuligai and Gowri Panchangam.
Auspicious dates calculated using classical exclusion rules (Rikta tithi, Guru Asta, Aadi/Margazhi masam). Separate categories for marriage, house-warming, business and vehicle purchase.
Daily, weekly and monthly Rasi Palan for all 12 signs, plus Guru and Sani Peyarchi transit tracking with 27-nakshatra personalization.
Full 10-koota marriage compatibility matching, computed offline from birth star and rasi.
Offline birth chart (Rasi Kattam) with lagna and planetary positions, no internet required.
Full Hindu festival and government holiday calendar, region-aware for Tamil Nadu, Sri Lanka, Singapore, Malaysia, UAE, USA, UK, Canada and Australia.
Real panchangam and rasi palan data, the same style shown on every daily update.
One documented method for every screen. Vakya and Thirukanitha are both respected traditions, and we tell you which one each value comes from.
Planet positions come from the Swiss Ephemeris library (sidereal, Lahiri ayanamsa: the Thirukanitha method). Tamil month starts follow the Vakya convention of printed almanacs. All timings are for Chennai, and the calendar, muhurtham and horoscope screens always agree.
Panchangam data is bundled on your device and syncs automatically when you're online — check tomorrow's thithi with no data connection.
The app never asks for your name, phone number or email. Notes, reminders and birth details stay on your device.
Available in Tamil, English and Tanglish (Tamil in English script) — switch anytime in Settings.
A Panchangam is the traditional Hindu almanac giving five daily elements — Thithi, Natchathiram (nakshatra), Yogam, Karanam and the weekday — along with auspicious and inauspicious timings such as Rahu Kalam, Yamagandam and Nalla Neram.
Aathan computes planet positions with the Swiss Ephemeris astronomy library on the sidereal zodiac with Lahiri (Chitra-paksha) ayanamsa, the Thirukanitha method. Tamil month start dates follow the Vakya convention used in popular printed almanacs, so month dates match the panchangam you use at home. All timings are for Chennai. The same calculations are used for every day from 1950 to 2100, so the calendar, muhurtham and horoscope screens always agree.
Yes, Aathan Tamil Calendar is free to download and use, supported by ads. No login or account is required.
Yes. Panchangam data is bundled on your device and syncs automatically when you're online, so you can check tomorrow's thithi or muhurtham dates without a data connection.
Region-aware holiday calendars are included for India (Tamil Nadu), Sri Lanka, Singapore, Malaysia, UAE, USA, UK, Canada and Australia.
There is no login, and the app never asks for your name, phone number or email. Notes, reminders and birth details for Jathagam/Porutham stay on your device. The app uses Google AdMob for ads and Firebase for anonymous usage statistics and notifications; the privacy policy explains exactly what these collect.
Free. No login. Works offline.