Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1925

Friday 23 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 346 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 Thursday 22 October

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 11:00  11:48 madhyāhna ends
10:1210:3611:0011:2411:4812:1212:36

0 of 48 minutes covered

Midday of Friday 23 October

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 11:00  11:48 madhyāhna ends
10:1210:3611:0011:2411:4812:1212:36

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 19:27 on Thu 22 Oct to 17:34 on Fri 23 Oct.

    1925-10-22T11:27:29Z → 1925-10-23T09:34:29Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:00–11:48 on the 22nd, 11:00–11:48 on the 23rd.

    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 22nd and 48 of 48 on the 23rd.

    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 20781 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Daqing, 1925: Friday 23 October.

    confidence: determinate

Say it like this

In Daqing, Sūrya Ṣaṣṭhī (Chhath) 1925 falls on Friday 23 October. Ṣaṣṭhī runs from 19:27 on Thu 22 Oct to 17:34 on Fri 23 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1925/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 23 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 23 Oct
compat-drikpanchangComparison profileFri 23 Oct
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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles03:27 → 01:3411:1348 min11:130 min22 Oct
Chicago05:27 → 03:3411:1148 min11:110 min22 Oct
Jersey City06:27 → 04:3411:1748 min11:160 min22 Oct
Port of Spain07:27 → 05:3411:2748 min11:260 min22 Oct
London11:27 → 09:3411:2141 min11:210 min22 Oct
Durban13:27 → 11:3411:170 min11:1718 min23 Oct
Dubai15:27 → 13:3411:390 min11:3948 min23 Oct
Delhi16:57 → 15:0411:410 min11:4148 min23 Oct
Kolkata16:57 → 15:0410:570 min10:5748 min23 Oct
Singapore18:27 → 16:3411:250 min11:2548 min23 Oct
Sydney21:27 → 19:3411:160 min11:1648 min23 Oct
Suva23:27 → 21:3411:270 min11:2748 min23 Oct
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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