Ruling · Sūrya Ṣaṣṭhī (Chhath) · 2012

Monday 19 November

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 12 minutes.

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 Sunday 18 November

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 11:01  11:49 madhyāhna ends
10:1310:3711:0111:2511:4912:1312:37

0 of 48 minutes covered

Midday of Monday 19 November

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 11:01  11:49 madhyāhna ends
Ṣaṣṭhī ends 12:01:25
10:1310:3711:0111:2511:4912:1312:37

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 13:54 on Sun 18 Nov to 12:01 on Mon 19 Nov.

    2012-11-18T05:54:15Z → 2012-11-19T04:01:25Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:01–11:49 on the 18th, 11:01–11:49 on the 19th.

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

  3. 03

    Rule

    Ṣaṣṭhī must be present during madhyāhna. It covers 0 of 48 minutes on the 18th and 48 of 48 on the 19th.

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

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: unstated → only-day · margin 734 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Daqing, 2012: Monday 19 November.

    confidence: determinate

Say it like this

In Daqing, Sūrya Ṣaṣṭhī (Chhath) 2012 falls on Monday 19 November. Ṣaṣṭhī runs from 13:54 on Sun 18 Nov to 12:01 on Mon 19 Nov and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2012/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 19 Nov
Ahargaṇa, classicalDisc centre, no refractionMon 19 Nov
compat-drikpanchangComparison profileMon 19 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/surya-shashthi · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Ṣaṣṭhī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 6 Nadi sasthi, Skanda sasthi (Madras), Surya sasthi, Chhat (Bihar).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMadhyāhna 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles21:54 → 20:0111:1448 min11:140 min18 Nov
Chicago23:54 → 22:0111:1248 min11:120 min18 Nov
Jersey City00:54 → 23:0111:1748 min11:180 min18 Nov
Port of Spain01:54 → 00:0111:2748 min11:280 min18 Nov
London05:54 → 04:0111:2248 min11:220 min18 Nov
Durban07:54 → 06:0111:1748 min11:180 min18 Nov
Dubai09:54 → 08:0111:4048 min11:400 min18 Nov
Delhi11:24 → 09:3111:4248 min11:420 min18 Nov
Kolkata11:24 → 09:3110:5821 min10:580 min18 Nov
Singapore13:54 → 12:0112:260 min12:260 min19 Nov
Sydney16:54 → 15:0112:170 min12:1748 min19 Nov
Suva18:54 → 17:0112:280 min12:2848 min19 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
surya-shashthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa