There's a whole section of rules on lunar days in Jyotish that take into consideration such phenomenon as Shoonya ("uselessness", "infertility") Tithi. Basic rule says that Shoonya Tithis are inauspicious and the one fails to achieve any success in works started during such kind of Tithi.
There are 3 types of combinations that create Shoonya Tithis:
There are 3 types of combinations that create Shoonya Tithis:
- certain Maasa (vedic month) + certain Tithi,
- certain Nakshatra (constellation) + certain Tithi,
- certain Lagna (ascendant) + certain Tithi.
| Maasa # / Name | Tithi |
| 1. Chaitra | Shukla Ashtami, Shukla Navami, Krishna Ashtami, Krishna Navami |
| 2. Vaishakha | Shukla Dwadashi, Krishna Dwadashi |
| 3. Jyaishtha | Shukla Trayodashi, Krishna Chaturdashi |
| 4. Ashadha | Shukla Shashti, Krishna Saptami |
| 5. Shravana | Shukla Dwitiya, Shukla Tritiya, Krishna Dwitiya, Krishna Tritya |
| 6. Bhadrapada | Shukla Pratipad, Shukla Dwitiya, Krishna Pratipad, Krishna Dwitiya |
| 7. Ashwina | Shukla Dashami, Shukla Ekadashi, Krishna Dashami, Krishna Ekadashi |
| 8. Kartika | Shukla Chaturdashi, Krishna Panchami |
| 9. Margashirsha | Shukla Saptami, Shukla Ashtami, Krishna Saptami, Krishna Ashtami |
| 10. Pausha | Shukla Chaturthi, Shukla Panchami, Krishna Chaturthi, Krishna Panchami |
| 11. Magha | Shukla Panchami, Krishna Shashti |
| 12. Phaguna | Shukla Tritiya, Krishna Chaturthi |
| Tithi # | Shoonya Nakshatra |
| 1. | Uttara Ashadha |
| 2. | Anuradha |
| 3. | Uttara Phalguni, Uttara Ashadha, Uttara Bhadrapada |
| 4. | none |
| 5. | Magha |
| 6. | Rohini |
| 7. | Hasta, Moola |
| 8. | Poorva Bhadrapada |
| 9. | Krttika |
| 10. | none |
| 11. | Rohini |
| 12. | Ashlesha |
| 13. | Chitra, Swati |
| 14. | none |
| 15. | none |
| Tithi # | Shoonya Lagna |
| 1. | Tula, Makara |
| 2. | none |
| 3. | Simha, Makara |
| 4. | none |
| 5. | Mithuna, Kanya |
| 6. | none |
| 7. | Karkata, Dhanu |
| 8. | none |
| 9. | Karkata, Simha |
| 10. | none |
| 11. | Dhanu, Meena |
| 12. | none |
| 13. | Meena (in some sources - Mesha), Vrishabha |
| 14. | none |
| 15. | none |
Taking into consideration everything mentioned above, during the vedic month Vaishakha Krishna Dwadashi becomes Maasa Shoonya Tithi. Ashlesha Nakshatra also activates Tithi Shoonya state if it falls on Krishna Dwadashi. Lagna (ascendant or rising sign) during Krishna Ekadashi becomes Tithi Shoonya for times when it is Dhanu (Sagittarius) or Meena (Pisces).
