Ruling · Rudra Vrata · 1901

Friday 13 September

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 315 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 Friday 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

Midday of Saturday 14 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 05:19 on Fri 13 Sep to 06:35 on Sat 14 Sep.

    1901-09-12T21:18:31Z → 1901-09-13T22:34:40Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:50–12:38 on the 13th, 11:50–12:38 on the 14th.

    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 13th and 0 of 48 on the 14th.

    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 18898 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 1901: Friday 13 September.

    confidence: determinate

Say it like this

In Baoding, Rudra Vrata 1901 falls on Friday 13 September. Pratipadā runs from 05:19 on Fri 13 Sep to 06:35 on Sat 14 Sep and covers all of madhyāhna that midday.

ahargana.org/baoding/festivals/1901/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 13 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 13 Sep
compat-drikpanchangComparison profileFri 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 Angeles13:19 → 14:3511:250 min11:2548 min13 Sep
Chicago15:19 → 16:3511:230 min11:2248 min13 Sep
Jersey City16:19 → 17:3511:280 min11:2848 min13 Sep
Port of Spain17:19 → 18:3511:380 min11:3848 min13 Sep
London21:19 → 22:3511:320 min11:3248 min13 Sep
Durban22:49 → 00:0510:590 min10:5848 min13 Sep
Dubai01:00 → 02:1611:320 min11:3248 min13 Sep
Delhi02:40 → 03:5611:440 min11:4448 min13 Sep
Kolkata02:40 → 03:5611:000 min11:0048 min13 Sep
Singapore04:14 → 05:3011:320 min11:3248 min13 Sep
Sydney07:19 → 08:3511:280 min11:2848 min13 Sep
Suva09:14 → 10:3011:340 min11:3448 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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