In Jainism, the term "5 tithi" refers to five specific lunar dates (tithis) in each lunar fortnight (paksha) that are considered particularly auspicious for spiritual activities, penance (tapa), and religious observances. The five tithis are:

1. Ashtami (8th day)
2. Chaturdashi (14th day)
3. Amavasya (new moon)
4. Purnima (full moon)
5. Chauth (4th day)

Difference between normal days and 5 tithi:

• Spiritual Importance: On these five tithis, Jains believe that the fruits of religious activities such as fasting (upvaas), pratikraman, meditation, and scriptural study are manifold compared to normal days. They are considered highly auspicious for performing vrat (vows) and other religious acts.

• Fasting and Vows: Many Jains observe special fasts or stricter forms of penance on these days. For example, "Pachakkhan" (vows of self-restraint) taken on these tithis are considered more meritorious.

• Temple Activities: Temples may have special rituals or gatherings. People often visit temples, listen to discourses, and participate in collective prayers.

• Normal Days: While religious practices are encouraged every day in Jainism, normal days do not carry the same heightened significance as the 5 tithis. The merit (punya) accrued from spiritual practices is considered greater on the 5 tithis.

Summary: The main difference is that the 5 tithis hold special spiritual significance and are considered more fruitful for religious activities than normal days, making them especially important in Jain practice and calendar.