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Onam dates (popular practice)

Onam is popular practice; no text read gives the day. Tiruvoṇam (Thiruvonam) in the month of Chiṅṅam (Chingam) in 2027, 2028 and 2029, by our stated rule, for Kochi, Thiruvananthapuram and your city.

Popular practice; no text read gives the day.

Next Onam in Kochi

Sunday, 12 September 2027

It is in 329 days.

Tiruvoṇam (Śravaṇa)Sun 12 Sep, 02:58 to Mon 13 Sep, 06:05
Atham (our reading; popular practice)Friday, 3 September 2027
Onam 2027 in every city

Onam dates, 2027 to 2029

Each city’s own sunrise
YearKochiThiruvananthapuramDubaiSydney
Onam 2027 Sun 12 SepSun 12 SepSun 12 SepMon 13 Sep
Onam 2028 Fri 1 SepFri 1 SepFri 1 SepFri 1 Sep
Onam 2029 Wed 22 AugWed 22 AugWed 22 AugThu 23 Aug

Popular practice; no text read gives the day. The six-nāḍikā test is our statement of common Kerala usage, not a rule from a text.

  • A civil day belongs to Chiṅṅam when the Sun is in sidereal Siṃha at its sunrise.
  • Onam, Tiruvoṇam, is the Chiṅṅam day whose sunrise falls in the Śravaṇa nakṣatra with at least six nāḍikās (2 h 24 min) of Śravaṇa left after it. If less remains, Onam is the day before, which holds most of it.
  • When Chiṅṅam holds two Tiruvoṇams, both are shown; the rule gives two days and does not choose.

Questions

By our stated rule; popular practice throughout.

When is Onam?

In Kochi, by our stated rule: Sunday, 12 September 2027; Friday, 1 September 2028; Wednesday, 22 August 2029. Each is Tiruvoṇam in the month of Chiṅṅam. Popular practice; no text read gives the day.

How is the Onam date found?

By our stated rule, from common Kerala usage: Onam is the day in the solar month of Chiṅṅam (Chingam) whose sunrise falls in the Śravaṇa nakṣatra (Tiruvoṇam) with at least six nāḍikās, 2 h 24 min, of it left; if less remains, the day before. A day is in Chiṅṅam when the Sun is in sidereal Siṃha at its sunrise.

Is Onam in the classical texts?

No. The Nirṇaya-sindhu, the Dharmasindhu and the Vratarāja have no Onam. The Śravaṇa-dvādaśī and the Vāmana-jayantī share its Vāmana story, but they are lunar days and give no date for it. DS pp. 56, 58

Why is the date different in Sydney or other cities?

The Sun enters Siṃha and the Moon enters and leaves Śravaṇa at the same moment everywhere, but sunrise comes at different hours. The sunrise that holds Śravaṇa with six nāḍikās left can then fall on another day.

How the day is found

Read the methodology
Basis
Popular practice; no text read gives the day. The rule is ours, stated in full.
Chiṅṅam
The civil days whose sunrise has the Sun in sidereal Siṃha (Lahiri ayanāṃśa), for the chosen city.
Tiruvoṇam
The Chiṅṅam day whose sunrise is in Śravaṇa with six nāḍikās (2 h 24 min) or more of it left. When less is left, Tiruvoṇam is the day before.
Atham
The last day before Tiruvoṇam whose sunrise is in Hasta with six nāḍikās or more of it left. When less is left, Atham is the day before. Our reading; popular practice.
Sunrise
At the centre of the Sun’s disc, with refraction, for the chosen city. Every date is that city’s own.

Sunrise and sunset at the centre of the Sun’s disc, with refraction · each city’s own time · Swiss Ephemeris · Method