Ruling · Vāmana Jayantī · 2031

Sunday 28 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 17 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Saturday 27 September

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:45  12:33 madhyāhna ends
Dvādaśī begins 12:50:02
10:5711:2111:4512:0912:3312:5713:21

0 of 48 minutes covered

Midday of Sunday 28 September

Taken. Dvādaśī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:45  12:33 madhyāhna ends
10:5711:2111:4512:0912:3312:5713:21

0 of 48 minutes covered

Dvādaśī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 12:50 on Sat 27 Sep to 10:07 on Sun 28 Sep.

    2031-09-27T04:50:03Z → 2031-09-28T02:07:16Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:45–12:33 on the 27th, 11:45–12:33 on the 28th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 27th and 0 of 48 on the 28th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: unstated → second-day · margin 1023 s

  5. 05

    Ruling

    Vāmana Jayantī, Baoding, 2031: Sunday 28 September.

    confidence: determinate

Say it like this

In Baoding, Vāmana Jayantī 2031 falls on Sunday 28 September. Dvādaśī runs from 12:50 on Sat 27 Sep to 10:07 on Sun 28 Sep, and reaches madhyāhna on neither day.

ahargana.org/baoding/festivals/2031/vamana-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 28 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 28 Sep
compat-drikpanchangComparison profileSat 27 Sep
No institution has a recorded ruling for Baoding.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/vamana-jayanti · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 12 Visnuparivartanotsava, Sakrotthana (in any of the naksatras U. Asadha, Sravana & Dhanistha), Kalki dvadasi, Sravana dvadasi (when combined with naksatra Sravana), Vamana jayanti (madhyahna vyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 27thCoveredMadhyāhna 28thCoveredRuled
Los Angeles21:50 → 19:0712:2048 min12:190 min27 Sep
Chicago23:50 → 21:0712:1748 min12:170 min27 Sep
Jersey City00:50 → 22:0712:2348 min12:230 min27 Sep
Port of Spain00:50 → 22:0711:3348 min11:330 min27 Sep
London05:50 → 03:0712:2748 min12:270 min27 Sep
Durban06:50 → 04:0711:2348 min11:230 min27 Sep
Dubai08:50 → 06:0711:4648 min11:450 min27 Sep
Delhi10:20 → 07:3711:4848 min11:480 min27 Sep
Kolkata10:20 → 07:3711:0448 min11:030 min27 Sep
Singapore12:50 → 10:0712:3230 min12:310 min27 Sep
Sydney14:50 → 12:0711:230 min11:2245 min28 Sep
Suva16:50 → 14:0711:340 min11:3348 min28 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vamana-jayanti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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