An annual tithi calculator is an essential tool in Vedic astrology and Hindu tradition used to determine the correct lunar dates for rituals, festivals, and memorial services. Because the Hindu lunar calendar varies significantly from the Gregorian calendar, these calculators bridge the gap to ensure ceremonies like (death anniversaries) are performed on the correct astrological day. Core Functionality
: Unlike fixed solar dates, tithis have varying start times and durations, typically lasting between 19 and 26 hours. annual tithi calculator portable