Ruling · Akhaṇḍa Dvādaśī · 2017

Friday 1 December

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 3 min 49 s away. Say “contested”.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Thursday 30 November

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:04  11:52 madhyāhna ends
Dvādaśī begins 11:56:16
10:1610:4011:0411:2811:5212:1612:40

0 of 48 minutes covered

Midday of Friday 1 December

Taken. Dvādaśī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:05  11:53 madhyāhna ends
10:1710:4111:0511:2911:5312:1712:41

0 of 48 minutes covered

Dvādaśī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 11:56 on Thu 30 Nov to 09:43 on Fri 1 Dec.

    2017-11-30T03:56:16Z → 2017-12-01T01:42:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:04–11:52 on the 30th, 11:05–11:53 on the 1st.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 0 of 48 minutes on the 30th and 0 of 48 on the 1st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: paraviddha → second-day · margin 229 s < 300 s

  5. 05

    Ruling

    Akhaṇḍa Dvādaśī, Daqing, 2017: Friday 1 December.

    confidence: boundary (margin)

Say it like this

In Daqing, Akhaṇḍa Dvādaśī 2017 falls on Friday 1 December. Dvādaśī runs from 11:56 on Thu 30 Nov to 09:43 on Fri 1 Dec, and reaches madhyāhna on neither day. It is 3 min 49 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/2017/akhanda-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 1 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 1 Dec
compat-drikpanchangComparison profileThu 30 Nov
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/akhanda-dvadashi · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 12 Matsya dvadasi, Akhanda dvadasi (paraviddha), Vyanjana dvadasi & Dana dvadasi (Orissa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 30thCoveredMadhyāhna 1stCoveredRuled
Los Angeles19:56 → 17:4311:1848 min11:180 min30 Nov
Chicago21:56 → 19:4311:1548 min11:160 min30 Nov
Jersey City22:56 → 20:4311:2148 min11:210 min30 Nov
Port of Spain23:56 → 21:4311:3148 min11:310 min30 Nov
London03:56 → 01:4311:2548 min11:250 min30 Nov
Durban05:56 → 03:4311:2148 min11:210 min30 Nov
Dubai07:56 → 05:4311:4348 min11:440 min30 Nov
Delhi09:26 → 07:1311:4648 min11:460 min30 Nov
Kolkata09:26 → 07:1311:0148 min11:010 min30 Nov
Singapore11:56 → 09:4312:2948 min12:300 min30 Nov
Sydney14:56 → 12:4312:200 min12:2023 min1 Dec
Suva16:56 → 14:4312:310 min12:3148 min1 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
akhanda-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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