Panchami is the fifth tithi of the bright fortnight, and in the fivefold grouping it is a Purna tithi, one of the full or complete days regarded as favourable and stable. Its presiding deities are traditionally the Nagas, the serpent spirits, and the day carries strong serpent associations: Naga Panchami, kept in the bright fortnight of the monsoon month of Shravana, is dedicated to their worship. Vasant Panchami, in the bright fortnight of Magha, honours Saraswati, goddess of learning, and marks the approach of spring. As a Purna tithi with the Moon now near its first quarter, the panchanga reads it as auspicious for a wide range of undertakings. These are the calendar tradition's conventions, resting on the Moon's steady progress toward its waxing quarter.
The Naga association attached to Panchami is old enough to appear across multiple unconnected observances beyond Naga Panchami itself, and some regional calendars keep a separate Naga-related tithi in other months as well, reflecting how central serpent veneration was to agrarian communities for whom snakes were both a genuine hazard and, as predators of rodents, protectors of the grain store. Vasant Panchami's dedication to Saraswati rather than to a serpent deity shows how the same numbered tithi can carry entirely different, non-overlapping associations depending on the month in which it falls, a pattern found throughout the panchanga where a tithi's fivefold classification is stable but its festival content is drawn from a much larger and less systematic body of regional and sectarian tradition.