Panchanga as a Classical Indian Calendar and Astronomical Knowledge System

This white paper studies Panchanga as a classical Indian astronomical and calendrical knowledge system. It explains the five limbs—vara, tithi, nakshatra, yoga, and karana—and the role of ephemeris, ayanamsa, location, sunrise, and regional convention. It separates computed astronomy from calendar rules, observance rules, and traditional interpretation, then proposes a reproducible framework for responsible digital Panchanga publication.