Ruling · Rudra Vrata · 2023

Friday 15 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 54 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 Friday 15 September

Taken. The only midday Pratipadā reaches.

madhyāhna begins 11:49  12:37 madhyāhna ends
11:0111:2511:4912:1312:3713:0113:25

48 of 48 minutes covered

Midday of Saturday 16 September

Pratipadā is absent from madhyāhna. Not taken.

madhyāhna begins 11:49  12:37 madhyāhna ends
Pratipadā ends 11:47:58
11:0111:2511:4912:1312:3713:0113:25

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 09:40 on Fri 15 Sep to 11:48 on Sat 16 Sep.

    2023-09-15T01:39:49Z → 2023-09-16T03:47:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:49–12:37 on the 15th, 11:49–12:37 on the 16th.

    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 15th and 0 of 48 on the 16th.

    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 54 s < 300 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 2023: Friday 15 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Rudra Vrata 2023 falls on Friday 15 September. Pratipadā runs from 09:40 on Fri 15 Sep to 11:48 on Sat 16 Sep and covers all of madhyāhna that midday. It is 0 min 54 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2023/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 15 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 15 Sep
compat-drikpanchangComparison profileFri 15 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 15thCoveredMadhyāhna 16thCoveredRuled
Los Angeles18:40 → 20:4812:2448 min12:240 min15 Sep
Chicago20:40 → 22:4812:2148 min12:210 min15 Sep
Jersey City21:40 → 23:4812:2748 min12:270 min15 Sep
Port of Spain21:40 → 23:4811:3748 min11:370 min15 Sep
London02:40 → 04:4812:3148 min12:310 min15 Sep
Durban03:40 → 05:4811:2748 min11:270 min15 Sep
Dubai05:40 → 07:4811:5048 min11:500 min15 Sep
Delhi07:10 → 09:1811:5248 min11:520 min15 Sep
Kolkata07:10 → 09:1811:0848 min11:070 min15 Sep
Singapore09:40 → 11:4812:3648 min12:360 min15 Sep
Sydney11:40 → 13:4811:2735 min11:2748 min15 Sep
Suva13:40 → 15:4811:380 min11:3848 min16 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

About Ahargaṇa