Sri Rama Navami is kept on Shukla Navami of the lunar month Chaitra. Ahnika Grantham adds one test: if Ashtami runs into the Navami day for 6 nazhigai or more, the festival moves to the next day. The Punarvasu star of the birth story is not a condition. For the date itself, the printed almanac of your tradition decides. A book's rule explains a date; it does not overrule the almanac.
☕ The rule, step by step
The month is lunar Chaitra, counted from the New Moon. So the festival can fall in the solar month Panguni or Chithirai; the book accepts both (Ahnika Grantham, Vol. 1 (Sri Ahobila Mutt), pp. 330–333).
The tithi is Shukla Navami. Then the book tests the day before it is accepted. If Ashtami overlaps the Navami day for 3 muhurtham (6 nazhigai) or more, the day is pierced (vedha), and the festival goes to the next day. If Ashtami runs for less than 6 nazhigai, there is no vedha and the first day stands.
Some tithis have an escape: when the tithi is absent the next day, the earlier day is taken even with vedha. The book says plainly that this does not apply to Rama Navami.
Punarvasu is the star of Rama's birth, and several of the book's own sources name it. The book still reasons past them: Punarvasu is incidental, not a condition. Requiring the whole birth sky would make the vow almost impossible to keep.
At a glance
- Month: lunar Chaitra, in solar Panguni or Chithirai.
- Tithi: Shukla Navami.
- Ashtami on the Navami day for 6 nazhigai or more: vedha, move to the next day.
- Ashtami under 6 nazhigai: no vedha, keep the day.
- Moved to the next day: keep it there even if Navami ended before that sunrise, on the Dasami.
- The star Punarvasu: incidental, not tested.
- What Nava does: Sri Rama Navami is kept on the day Shukla Navami of nija (not adhika) Chaitra holds sunrise. When Navami holds no sunrise, it is kept on the day Navami begins. The book's 6-nazhigai Ashtami test is not run as a separate step, and no star is checked.
Frequently asked questions
Does Rama Navami need the Punarvasu star?
No. Ahnika Grantham treats Punarvasu as incidental. The rule is the tithi: Chaitra Shukla Navami, with the Ashtami test.
Why is Rama Navami sometimes in Panguni and sometimes in Chithirai?
The month is lunar Chaitra, which begins at a New Moon. The month opens at the New Moon before the Sun enters Mesha. The Navami, about eight days later, can fall before or after that entry, so the festival can land in either solar month.
What happens in a year with an extra (adhika) Chaitra?
Nava keeps the festival in the nija Chaitra, the regular month, not the extra one.
Deep dive: the Ashtami test on a sample year
Two days, two ways the test can go.
🧮 Ashtami ends early, then late
Sunrise 06:00 on both days. One nazhigai is 24 minutes, so 6 nazhigai is 2 hours 24 minutes.
- Ashtami ends at 07:30, then Navami runs on. Ashtami held the day for 1 hour 30 minutes, under the limit: no vedha. Rama Navami is this day.
- Ashtami ends at 11:00 instead. It held the day for 5 hours, over the limit: vedha. The book moves Rama Navami to the next day.
Nava reads sunrise instead. In the first case Navami usually still holds the next sunrise, so Nava's day is the next day, one day after the book's. In the second case both agree on the next day.
🔗 Read first
This page builds on vedha, a neighbouring tithi’s touch, which explains what it means for one tithi to pierce another’s day.