Ruling · Rudra Vrata · 2050

Friday 16 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 35 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 16 September

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:49  12:37 madhyāhna ends
Pratipadā begins 11:49:23
11:0111:2511:4912:1312:3713:0113:25

47 of 48 minutes covered, the last 47

Midday of Saturday 17 September

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:48  12:36 madhyāhna ends
11:0011:2411:4812:1212:3613:0013:24

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 11:49 on Fri 16 Sep to 14:18 on Sat 17 Sep.

    2050-09-16T03:49:24Z → 2050-09-17T06:17:49Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:49–12:37 on the 16th, 11:48–12:36 on the 17th.

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

  3. 03

    Rule

    Pratipadā must be present during madhyāhna. It covers 47 of 48 minutes on the 16th and 48 of 48 on the 17th.

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

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 35 s < 300 s

  5. 05

    Ruling

    Rudra Vrata, Baoding, 2050: Friday 16 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Rudra Vrata 2050 falls on Friday 16 September. Pratipadā runs from 11:49 on Fri 16 Sep to 14:18 on Sat 17 Sep and covers 47 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 0 min 35 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2050/rudra-vrata · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 16 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 16 Sep
compat-drikpanchangComparison profileFri 16 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 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles20:49 → 23:1812:2348 min12:230 min16 Sep
Chicago22:49 → 01:1812:2148 min12:210 min16 Sep
Jersey City23:49 → 02:1812:2748 min12:260 min16 Sep
Port of Spain23:49 → 02:1811:3748 min11:360 min16 Sep
London04:49 → 07:1812:3148 min12:310 min16 Sep
Durban05:49 → 08:1811:2748 min11:270 min16 Sep
Dubai07:49 → 10:1811:5048 min11:490 min16 Sep
Delhi09:19 → 11:4811:5248 min11:510 min16 Sep
Kolkata09:19 → 11:4811:0748 min11:0741 min16 Sep
Singapore11:49 → 14:1812:3648 min12:3548 min16 Sep
Sydney13:49 → 16:1811:260 min11:2648 min17 Sep
Suva15:49 → 18:1811:370 min11:3748 min17 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