While there is no single ".exe" file officially named "annual tithi calculator portable," several professional-grade astrology tools and specialized mobile apps function as portable, offline calculators for annual Tithis, particularly for tracking death anniversaries (Shraddha) or birthdays. Recommended Portable & Offline Tools
The old priest shook his head. “The stars do not obey your silicon chips, my son. A tithi is not a date. It is a relationship between the sun and moon. It changes with longitude, latitude, and even the ayanamsa (precession of equinoxes).” annual tithi calculator portable