Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1921

Saturday 5 November

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 152 minutes.

Decide it for

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 Saturday 5 November

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 10:59  11:47 madhyāhna ends
10:1110:3510:5911:2311:4712:1112:35

48 of 48 minutes covered

Midday of Sunday 6 November

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 10:59  11:47 madhyāhna ends
10:1110:3510:5911:2311:4712:1112:35

0 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 06:43 on Sat 5 Nov to 08:27 on Sun 6 Nov.

    1921-11-04T22:43:18Z → 1921-11-06T00:27:10Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 10:59–11:47 on the 5th, 10:59–11:47 on the 6th.

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

  3. 03

    Rule

    Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 5th and 0 of 48 on the 6th.

    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 9135 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Daqing, 1921: Saturday 5 November.

    confidence: determinate

Say it like this

In Daqing, Sūrya Ṣaṣṭhī (Chhath) 1921 falls on Saturday 5 November. Ṣaṣṭhī runs from 06:43 on Sat 5 Nov to 08:27 on Sun 6 Nov and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1921/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 5 Nov
Ahargaṇa, classicalDisc centre, no refractionSat 5 Nov
compat-drikpanchangComparison profileSat 5 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 4thCoveredMadhyāhna 6thCoveredRuled
Los Angeles14:43 → 16:2711:120 min11:130 min5 Nov
Chicago16:43 → 18:2711:100 min11:100 min5 Nov
Jersey City17:43 → 19:2711:160 min11:160 min5 Nov
Port of Spain18:43 → 20:2711:260 min11:260 min5 Nov
London22:43 → 00:2711:200 min11:200 min5 Nov
Durban00:43 → 02:2711:160 min11:160 min5 Nov
Dubai02:43 → 04:2711:380 min11:380 min5 Nov
Delhi04:13 → 05:5711:410 min11:410 min5 Nov
Kolkata04:13 → 05:5710:560 min10:560 min5 Nov
Singapore05:43 → 07:2711:240 min11:240 min5 Nov
Sydney08:43 → 10:2711:150 min11:150 min5 Nov
Suva10:43 → 12:2711:260 min11:2648 min5 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

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