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Understanding Tithis - The Lunar Calendar
How the lunar day system works and which tithis are most significant for daily life.
The tithi (lunar day) is arguably the most important element of the Panchang for scheduling important life activities. Unlike the solar calendar day, which is a fixed 24 hours, the tithi breathes with the actual Moon.
THE 30 TITHIS: The lunar month has 30 tithis, 15 in each fortnight:
Krishna Paksha (dark fortnight - full moon to new moon): The same sequence from Pratipada to Chaturdashi, ending in Amavasya (New Moon - 30th).
THE MOST IMPORTANT TITHIS:
Purnima (Full Moon): The most auspicious tithi for most activities. Pilgrimage, spiritual practice, major commitments, and celebrations. Also associated with heightened emotions and energy.
Ekadashi (11th day of each fortnight): Sacred to Vishnu. Traditionally observed as a partial or complete fast. Considered powerful for spiritual practice and clearing negative karma. Occurs twice a month.
Amavasya (New Moon): A powerful but sensitive day. Considered inauspicious for new beginnings in classical muhurat; excellent for ancestor rituals (Pitru Tarpan), deep introspection, and endings/completions.
Chaturthi (4th day): Sacred to Ganesha. Vinayaka Chaturthi (in Bhadrapada month) is the major festival day; monthly Chaturthi is observed by many devotees.
THE QUALITY OF EACH TITHI: Tithis 1, 6, 11 (Pratipada, Shashthi, Ekadashi): Good for new starts. Tithis 2, 7, 12 (Dvitiya, Saptami, Dwadashi): Mixed. Tithis 4, 9, 14 (Chaturthi, Navami, Chaturdashi): Often classified as Rikta (empty) - avoid major new commitments. Purnima and Amavasya: Special significance; Purnima generally auspicious for most acts, Amavasya reserved for ancestral rites.
WHEN TITHIS SKIP OR REPEAT: Because tithis do not exactly match solar days, occasionally a tithi will complete within one calendar day (skipping - called Kshaya tithi) or extend across two calendar days (repeating - called Vriddhi tithi). The Panchang tracks these precisely and your Today reading uses the correct tithi for the current moment of the day.
Key Takeaway
The tithi tells you where you are in the Moon's cycle relative to the Sun. The Moon's phase is the original calendar; the Panchang makes it practical.