Answer

In Jain Dharma, the best tithis to end a puja, vrat, anushthan, or tapasya and to do parna are usually chosen carefully with guidance from a Jain Guru, sadhu-sadhvi, or knowledgeable pandit.

Generally, auspicious Jain tithis include:

• Beej – 2nd tithi
• Pancham – 5th tithi
• Atham – 8th tithi
• Agiyaras – 11th tithi
• Chaudas – 14th tithi
• Poonam – Full moon
• Amas – New moon

For parna, many Jains especially prefer spiritually significant days such as:

• Atham
• Chaudas
• Poonam
• Amas
• Agiyaras

Explanation

Parna means respectfully ending a fast or tapasya by taking food or water at the proper time and in the proper way.

For Jain tapasya, the most important factors are:

• The correct completion of the vow
• Proper timing of parna
• Purity of mind and food
• Guidance from Guru or sangh tradition
• Observing Jain maryada

If the puja or tapasya is connected with a specific vrat, mantra-jap, ayambil, upvas, oli, athai, masakshaman, or other anushthan, then the parna should be done according to the rule of that specific practice.

Spiritual Understanding

In Jain Dharma, the tithi is important, but the inner bhav is even more important. Ending a puja or doing parna should be done with:

• Vinay
• Gratitude
• Samyaktva-bhav
• Ahimsa
• Self-control
• No pride in tapasya

The purpose of parna is not just to eat after fasting, but to complete the tapasya with humility and spiritual awareness.

Takeaway

For general purposes, Atham, Agiyaras, Chaudas, Poonam, and Amas are commonly considered spiritually significant. But for exact parna or ending of a specific puja or tapasya, it is best to follow your Guru’s guidance and your Jain tradition’s calendar.