Ruling · Bhīṣma Dvādaśī · 2066

Saturday 6 February

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 35 s away. Say “contested”.

Decide it for

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 Saturday 6 February

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

madhyāhna begins 12:08  12:56 madhyāhna ends
11:2011:4412:0812:3212:5613:2013:44

48 of 48 minutes covered

Midday of Sunday 7 February

Qualifies with 45 of 48 minutes. Not taken.

madhyāhna begins 12:09  12:57 madhyāhna ends
Dvādaśī ends 12:53:57
11:2111:4512:0912:3312:5713:2113:45

45 of 48 minutes covered, the first 45

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 10:41 on Sat 6 Feb to 12:54 on Sun 7 Feb.

    2066-02-06T02:40:36Z → 2066-02-07T04:53:57Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:08–12:56 on the 6th, 12:09–12:57 on the 7th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 6th and 45 of 48 on the 7th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 155 s < 300 s

  5. 05

    Ruling

    Bhīṣma Dvādaśī, Baoding, 2066: Saturday 6 February.

    confidence: boundary (margin)

Say it like this

In Baoding, Bhīṣma Dvādaśī 2066 falls on Saturday 6 February. Dvādaśī runs from 10:41 on Sat 6 Feb to 12:54 on Sun 7 Feb and covers all of madhyāhna that midday. It also reaches the next midday for 45 minutes; by the rule the first midday is taken. It is 2 min 35 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2066/bhishma-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 6 Feb
Ahargaṇa, classicalDisc centre, no refractionSat 6 Feb
compat-drikpanchangComparison profileSat 6 Feb
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/bhishma-dvadashi · ruleset 2026.3-draft

Month
Māgha, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 105

“S 12 Bhisma dvadasi (purvaviddha), Amalaki dvadasi, Santana dvadasi, Varaha dvadasi” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 6thCoveredMadhyāhna 7thCoveredRuled
Los Angeles18:41 → 20:5411:4348 min11:430 min6 Feb
Chicago20:41 → 22:5411:4148 min11:410 min6 Feb
Jersey City21:41 → 23:5411:4748 min11:470 min6 Feb
Port of Spain22:41 → 00:5411:5648 min11:560 min6 Feb
London02:41 → 04:5411:5148 min11:510 min6 Feb
Durban04:41 → 06:5411:4648 min11:460 min6 Feb
Dubai06:41 → 08:5412:0948 min12:090 min6 Feb
Delhi08:11 → 10:2412:1148 min12:110 min6 Feb
Kolkata08:11 → 10:2411:2748 min11:270 min6 Feb
Singapore10:41 → 12:5412:5548 min12:550 min6 Feb
Sydney13:41 → 15:5412:450 min12:4548 min7 Feb
Suva14:41 → 16:5411:560 min11:5648 min7 Feb
Profile · tradition
pac-rp@2026.1 · smarta
Rule
bhishma-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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