Onam (Thiruvonam)
Thiruvonam (Shravana nakshatra) in the Malayalam solar month Chingam, the tenth day of the festival that begins on Atham.
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- CategoryFestival Major
- RegionRegional observance: Kerala
- Defining tithi / momentShravana: to
Timings on Sunday, 12 September 2027
Rule applied: Regional calendar — Kerala rule: the nakshatra prevails at this day’s sunrise for at least 6 nazhikas.
Recipes, stories and temples
Prasad to make
Story for children
Across India
How this festival is celebrated in different regions, with the regional names and each date's rule.
How the date is determined
- The month is the Malayalam solar month of sidereal Simha (Leo): it begins on the day the Sun enters Simha (Leo) by the Kerala rule (before 3/5 of the daytime has passed, the end of Madhyahna, else the next day) and ends on the day before the next month begins.
- Shravana belongs to the day at whose sunrise it prevails for at least 6 nazhikas (6/60 of the day, about 2 hours 24 minutes); if it lasts less than that after sunrise, it belongs to the previous day, on which it began; if it touches no sunrise, to the day that contains it.
- If the month has two Shravana days, the later one is taken: the first comes so early that the first day of the festival, Atham, would fall in the previous month.
- Sidereal positions use the ayanamsa of your calculation profile; a different ayanamsa can shift the moment by several minutes.
Traditional variation
When Chingam contains two Thiruvonams (the first then falls in its first five days, with its Atham, the first day of the ten-day festival, in Karkidakam), Onam is kept on the second, e.g. 15 September 2024; the first is shown as not selected. Kerala panchangs can differ on the nakshatra-day threshold (6 nazhikas after sunrise is used here); verify with a Kerala panchang in borderline years.
This is the date given by the rule shown above for the selected place. It is not the only valid date: regional Panchangs, family customs and sampradayas may observe it on a different day.
Rule source: Kerala solar calendar: Thiruvonam in Chingam (Kerala panchang rule). Chingam runs from its Kerala month start (Simha Sankranti before 3/5 of the daytime has passed, the end of Madhyahna, else the next day) to the day before Kanni 1; Thiruvonam belongs to the day at whose sunrise it prevails for at least 6 nazhikas, else to the previous day (one that touches no sunrise: the day that contains it); when Chingam has two Thiruvonams, the later one, whose Atham also falls in Chingam.
Traditions may vary by region and Panchang convention. Times are shown for the selected place, time zone and calculation profile.
Calculated with engine 1.4.2 · rules rules-2026-09-29-a0a4505e · profile north-lahiri-calibrated v1 · ayanamsa lahiri_drik_compat · astronomy-engine@2.1.19 · Asia/Kolkata
Dates in 2026
| Date | Defining tithi / moment | Time windows | Decision notes |
|---|---|---|---|
| 26/08/2026 (Wed) | Shravana: to | — | Standard rule applied |
Dates in 2027
| Date | Defining tithi / moment | Time windows | Decision notes |
|---|---|---|---|
| 12/09/2027 (Sun) Next | Shravana: to | — | Standard rule applied |