Ruling · Vāmana Jayantī · 1913

Thursday 11 September

Boundaryin Baoding, under the Rashtriya Panchang method. Both middays qualify and the rule does not say which to take. Say “contested”.

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 Thursday 11 September

Taken. Both middays qualify; the rule is silent, and this one is covered longer.

madhyāhna begins 11:51  12:39 madhyāhna ends
Dvādaśī begins 11:30:34
11:0311:2711:5112:1512:3913:0313:27

48 of 48 minutes covered

Midday of Friday 12 September

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:50  12:38 madhyāhna ends
Dvādaśī ends 13:25:02
11:0211:2611:5012:1412:3813:0213:26

48 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 11:31 on Thu 11 Sep to 13:25 on Fri 12 Sep.

    1913-09-11T03:30:35Z → 1913-09-12T05:25:02Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:51–12:39 on the 11th, 11:50–12:38 on the 12th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 11th and 48 of 48 on the 12th.

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

  4. 04

    Tie-break

    Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 1206 s

  5. 05

    Ruling

    Vāmana Jayantī, Baoding, 1913: Thursday 11 September.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Vāmana Jayantī 1913 falls on Thursday 11 September. Dvādaśī runs from 11:31 on Thu 11 Sep to 13:25 on Fri 12 Sep and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/baoding/festivals/1913/vamana-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 11 Sep
Ahargaṇa, classicalDisc centre, no refractionThu 11 Sep
compat-drikpanchangComparison profileFri 12 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 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles19:31 → 21:2511:2548 min11:250 min11 Sep
Chicago21:31 → 23:2511:2348 min11:230 min11 Sep
Jersey City22:31 → 00:2511:2948 min11:280 min11 Sep
Port of Spain23:31 → 01:2511:3948 min11:380 min11 Sep
London03:31 → 05:2511:3348 min11:320 min11 Sep
Durban05:31 → 07:2511:2948 min11:290 min11 Sep
Dubai07:12 → 09:0611:3248 min11:320 min11 Sep
Delhi09:01 → 10:5511:5448 min11:530 min11 Sep
Kolkata09:01 → 10:5511:0948 min11:090 min11 Sep
Singapore10:31 → 12:2511:3748 min11:3748 min11 Sep
Sydney13:31 → 15:2511:280 min11:2848 min12 Sep
Suva15:26 → 17:2011:340 min11:3448 min12 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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