Ruling · Rudra Vrata · 1931

Saturday 12 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 12 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 12 September

Taken. The only midday Pratipadā reaches.

madhyāhna begins 11:50  12:38 madhyāhna ends
Pratipadā begins 12:26:20
11:0211:2611:5012:1412:3813:0213:26

12 of 48 minutes covered, the last 12

Midday of Sunday 13 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 12:26 on Sat 12 Sep to 08:44 on Sun 13 Sep.

    1931-09-12T04:26:20Z → 1931-09-13T00:43:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:50–12:38 on the 12th, 11:50–12:38 on the 13th.

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

  3. 03

    Rule

    Pratipadā must be present during madhyāhna. It covers 12 of 48 minutes on the 12th and 0 of 48 on the 13th.

    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 728 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 1931: Saturday 12 September.

    confidence: determinate

Say it like this

In Baoding, Rudra Vrata 1931 falls on Saturday 12 September. Pratipadā runs from 12:26 on Sat 12 Sep to 08:44 on Sun 13 Sep and covers 12 of 48 minutes of madhyāhna that midday.

ahargana.org/baoding/festivals/1931/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 12 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 12 Sep
compat-drikpanchangComparison profileSat 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/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 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles20:26 → 16:4411:2548 min11:250 min12 Sep
Chicago23:26 → 19:4412:2348 min12:220 min12 Sep
Jersey City00:26 → 20:4412:2848 min12:280 min12 Sep
Port of Spain00:26 → 20:4411:3848 min11:380 min12 Sep
London05:26 → 01:4412:3348 min12:320 min12 Sep
Durban06:26 → 02:4411:2948 min11:280 min12 Sep
Dubai08:26 → 04:4411:5148 min11:510 min12 Sep
Delhi09:56 → 06:1411:5348 min11:530 min12 Sep
Kolkata09:56 → 06:1411:0948 min11:090 min12 Sep
Singapore11:26 → 07:4411:3748 min11:370 min12 Sep
Sydney14:26 → 10:4411:280 min11:280 min13 Sep
Suva16:26 → 12:4411:390 min11:3948 min13 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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