Ruling · Govatsa Dvādaśī (Vasu Baras) · 2012

Saturday 10 November

Boundaryin Daqing, under the Rashtriya Panchang method. Dvādaśī reaches pradoṣa on neither day and the rule does not say what then. Say “contested”.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

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

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Saturday 10 November

Taken. Dvādaśī reaches neither evening; this is the day it falls on.

16:12 sunsetpradoṣa ends 18:07
Dvādaśī begins 18:18:36
15:4816:1216:3617:0017:2417:4818:1218:36

0 of 115 minutes covered

Evening of Sunday 11 November

Dvādaśī is absent from pradoṣa. Not taken.

16:11 sunsetpradoṣa ends 18:07
Dvādaśī ends 15:58:13
15:4716:1116:3516:5917:2317:4718:1118:35

0 of 116 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 18:19 on Sat 10 Nov to 15:58 on Sun 11 Nov.

    2012-11-10T10:18:37Z → 2012-11-11T07:58:14Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:12–18:07 on the 10th, 16:11–18:07 on the 11th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Dvādaśī must be present during pradoṣa. It covers 0 of 115 minutes on the 10th and 0 of 116 on the 11th.

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

  4. 04

    Tie-break

    Neither evening qualifies. The day the tithi falls on is taken.

    priority: purvaviddha → tithi-day · margin 672 s

  5. 05

    Ruling

    Govatsa Dvādaśī, Daqing, 2012: Saturday 10 November.

    confidence: boundary (absent-unstated)

Say it like this

In Daqing, Govatsa Dvādaśī (Vasu Baras) 2012 falls on Saturday 10 November. Dvādaśī runs from 18:19 on Sat 10 Nov to 15:58 on Sun 11 Nov, and reaches pradoṣa on neither day.

ahargana.org/daqing/festivals/2012/govatsa-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 10 Nov
Ahargaṇa, classicalDisc centre, no refractionSat 10 Nov
compat-drikpanchangComparison profileSat 10 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/govatsa-dvadashi · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Kṛṣṇa · Dvādaśī
Kāla
Pradoṣa
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“K 12 Govatsa dvadasi (pradosa vyapini). If occurs on two days, it is to be observed on the first day.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīSunset 10thCoveredSunset 11thCoveredRuled
Los Angeles02:19 → 23:5816:52108 min16:510 min10 Nov
Chicago04:19 → 01:5816:34112 min16:330 min10 Nov
Jersey City05:19 → 02:5816:42112 min16:410 min10 Nov
Port of Spain06:19 → 03:5817:4099 min17:400 min10 Nov
London10:19 → 07:5816:17119 min16:160 min10 Nov
Durban12:19 → 09:5818:2584 min18:260 min10 Nov
Dubai14:19 → 11:5817:33104 min17:320 min10 Nov
Delhi15:49 → 13:2817:30106 min17:290 min10 Nov
Kolkata15:49 → 13:2816:54103 min16:540 min10 Nov
Singapore18:19 → 15:5818:5096 min18:500 min10 Nov
Sydney21:19 → 18:5819:310 min19:320 min10 Nov
Suva23:19 → 20:5819:170 min19:1889 min11 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
govatsa-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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