Ruling · Rudra Vrata · 1912

Wednesday 11 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 18 s away. 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 Wednesday 11 September

Taken. The only midday Pratipadā reaches.

madhyāhna begins 11:51  12:39 madhyāhna ends
Pratipadā begins 11:48:17
11:0311:2711:5112:1512:3913:0313:27

48 of 48 minutes covered

Midday of Thursday 12 September

Pratipadā is absent from madhyāhna. Not taken.

madhyāhna begins 11:50  12:38 madhyāhna ends
11:0211:2611:5012:1412:3813:0213:26

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pratipadā runs from 11:48 on Wed 11 Sep to 08:44 on Thu 12 Sep.

    1912-09-11T03:48:17Z → 1912-09-12T00:44:25Z

  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

    Pratipadā must be present during madhyāhna. It covers 48 of 48 minutes on the 11th and 0 of 48 on the 12th.

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

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 138 s < 300 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 1912: Wednesday 11 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Rudra Vrata 1912 falls on Wednesday 11 September. Pratipadā runs from 11:48 on Wed 11 Sep to 08:44 on Thu 12 Sep and covers all of madhyāhna that midday. It is 2 min 18 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1912/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 11 Sep
Ahargaṇa, classicalDisc centre, no refractionWed 11 Sep
compat-drikpanchangComparison profileWed 11 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/rudra-vrata · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Pratipadā
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“S 1 Rudra vrata (purvaviddha).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePratipadāMadhyāhna 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles19:48 → 16:4411:2548 min11:250 min11 Sep
Chicago21:48 → 18:4411:2348 min11:220 min11 Sep
Jersey City22:48 → 19:4411:2948 min11:280 min11 Sep
Port of Spain23:48 → 20:4411:3948 min11:380 min11 Sep
London03:48 → 00:4411:3348 min11:320 min11 Sep
Durban05:48 → 02:4411:2948 min11:280 min11 Sep
Dubai07:29 → 04:2511:3248 min11:320 min11 Sep
Delhi09:18 → 06:1411:5448 min11:530 min11 Sep
Kolkata09:18 → 06:1411:0948 min11:090 min11 Sep
Singapore10:48 → 07:4411:3748 min11:370 min11 Sep
Sydney13:48 → 10:4411:280 min11:280 min12 Sep
Suva15:43 → 12:3911:340 min11:3448 min12 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rudra-vrata@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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