The Sanskrit calendar, in brief
The "Sanskrit calendar" isn't one single document — it's a system, built up from a few interlocking parts that classical Indian astronomers refined over roughly two thousand years. Unlike the Gregorian calendar's fixed 12 months of fixed length, the Sanskrit calendar is lunisolar: its months follow the Moon, while a periodic correction keeps the whole system anchored to the solar year and its seasons.
A Sanskrit month runs from new moon to new moon (or full moon to full moon, depending on regional tradition) — roughly 29.5 days, not a fixed 30 or 31. Twelve of these lunar months add up to about 354 days, eleven days short of the 365-day solar year the seasons actually follow. Left uncorrected, festivals would drift through the seasons over a human lifetime — so roughly every 32 months, an extra "leap month" (Adhik Masa) is inserted to pull the calendar back in step with the Sun.
Its building blocks: the 12 Masa (months), each named after a Nakshatra; the six Ritu (seasons), from Vasanta to Shishira; the five daily elements of the Panchanga; the two eras, Vikram Samvat and Shaka Samvat; and the 60-year Samvatsara cycle underneath both. To see it all on today's date, open Sanskrit Calendar Today; for the whole year at a glance, see the Sanskrit Calendar 2026 and 2027 overviews.