Annual Tithi Calculator Portable Exclusive

For years, 70-year-old Rameshji carried a heavy, worn-out panchang (traditional calendar) everywhere he went. His daughter, Priya, lived in New York, and his son, Rohan, was moving to Singapore. Rameshji was the anchor, tasked with reminding everyone of the exact annual tithis (lunar dates) for their ancestors’ shradh and various festivals.

4. How It Works (Technical Overview)

A. For a Physical Slide Chart or Wheel Calculator:

• Inner wheel: Gregorian months (Jan–Dec) and days (1–31).
• Outer wheel: Tithi names (Pratipada to Amavasya/Purnima) and lunar months (Chaitra to Phalguna).
• Alignment marks based on a fixed reference year (e.g., 2025) plus correction factors for leap years and lunar adjustments.
• Limitation: Accuracy decreases after 3–4 years without recalibration.

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Conclusion

A portable annual tithi calculator bridges traditional lunar timekeeping with modern convenience. By combining reliable astronomical calculations, clear presentation of local tithi times, offline capability, and user-configurable conventions, such a tool serves religious practitioners, scholars, and travelers who need trustworthy, on-the-go lunar day information. For years, 70-year-old Rameshji carried a heavy, worn-out

What is a Tithi?

To understand the calculator, one must understand the unit. A Tithi is the time it takes for the longitudinal angle between the Moon and the Sun to increase by 12°. There are 30 Tithis in a lunar month, divided into two Pakshas (fortnights): Inner wheel: Gregorian months (Jan–Dec) and days (1–31)

1. Input Date and Location: Enter the desired date and location into the calculator.
2. Select Calculation Type: Choose the type of calculation required (e.g., Tithi, Hindu date, or auspicious time).
3. Obtain Results: The calculator will display the calculated Tithi, start and end times, and corresponding Hindu date.