Ruling · Vāmana Jayantī · 1912

Sunday 22 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

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 Sunday 22 September

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

madhyāhna begins 11:47  12:35 madhyāhna ends
Dvādaśī begins 11:37:21
10:5911:2311:4712:1112:3512:5913:23

48 of 48 minutes covered

Midday of Monday 23 September

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:46  12:34 madhyāhna ends
10:5811:2211:4612:1012:3412:5813:22

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 11:37 on Sun 22 Sep to 14:01 on Mon 23 Sep.

    1912-09-22T03:37:21Z → 1912-09-23T06:01:13Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:47–12:35 on the 22nd, 11:46–12:34 on the 23rd.

    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 22nd and 48 of 48 on the 23rd.

    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 562 s

  5. 05

    Ruling

    Vāmana Jayantī, Baoding, 1912: Sunday 22 September.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Vāmana Jayantī 1912 falls on Sunday 22 September. Dvādaśī runs from 11:37 on Sun 22 Sep to 14:01 on Mon 23 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/1912/vamana-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 22 Sep
Ahargaṇa, classicalDisc centre, no refractionSun 22 Sep
compat-drikpanchangComparison profileMon 23 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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles19:37 → 22:0111:2148 min11:210 min22 Sep
Chicago21:37 → 00:0111:1948 min11:190 min22 Sep
Jersey City22:37 → 01:0111:2548 min11:240 min22 Sep
Port of Spain23:37 → 02:0111:3548 min11:340 min22 Sep
London03:37 → 06:0111:2948 min11:280 min22 Sep
Durban05:37 → 08:0111:2548 min11:250 min22 Sep
Dubai07:18 → 09:4211:2848 min11:280 min22 Sep
Delhi09:07 → 11:3111:5048 min11:490 min22 Sep
Kolkata09:07 → 11:3111:0548 min11:0526 min22 Sep
Singapore10:37 → 13:0111:3348 min11:3348 min22 Sep
Sydney13:37 → 16:0111:240 min11:2448 min23 Sep
Suva15:32 → 17:5611:300 min11:3048 min23 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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