Ruling · Rudra Vrata · 1920

Monday 13 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 399 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 Sunday 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

Midday of Monday 13 September

Taken. The only midday Pratipadā reaches.

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

48 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 20:51 on Sun 12 Sep to 19:17 on Mon 13 Sep.

    1920-09-12T12:51:24Z → 1920-09-13T11:17:07Z

  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 0 of 48 minutes on the 12th and 48 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 23954 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 1920: Monday 13 September.

    confidence: determinate

Say it like this

In Baoding, Rudra Vrata 1920 falls on Monday 13 September. Pratipadā runs from 20:51 on Sun 12 Sep to 19:17 on Mon 13 Sep and covers all of madhyāhna that midday.

ahargana.org/baoding/festivals/1920/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 13 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 13 Sep
compat-drikpanchangComparison profileMon 13 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 Angeles04:51 → 03:1711:2548 min11:250 min12 Sep
Chicago07:51 → 06:1712:2248 min12:220 min12 Sep
Jersey City08:51 → 07:1712:2848 min12:280 min12 Sep
Port of Spain08:51 → 07:1711:3848 min11:380 min12 Sep
London13:51 → 12:1712:320 min12:320 min13 Sep
Durban14:51 → 13:1711:280 min11:2848 min13 Sep
Dubai16:51 → 15:1711:510 min11:5148 min13 Sep
Delhi18:21 → 16:4711:530 min11:5348 min13 Sep
Kolkata18:21 → 16:4711:090 min11:0848 min13 Sep
Singapore19:51 → 18:1711:370 min11:3748 min13 Sep
Sydney22:51 → 21:1711:280 min11:2848 min13 Sep
Suva00:51 → 23:1711:390 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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