Ruling · Sūrya Ṣaṣṭhī (Chhath) · 2017

Thursday 26 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 20 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 Wednesday 25 October

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 11:00  11:48 madhyāhna ends
Ṣaṣṭhī begins 12:08:15
10:1210:3611:0011:2411:4812:1212:36

0 of 48 minutes covered

Midday of Thursday 26 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 12:08 on Wed 25 Oct to 14:46 on Thu 26 Oct.

    2017-10-25T04:08:15Z → 2017-10-26T06:45:50Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:00–11:48 on the 25th, 11:00–11:48 on the 26th.

    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 25th and 48 of 48 on the 26th.

    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 1229 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Daqing, 2017: Thursday 26 October.

    confidence: determinate

Say it like this

In Daqing, Sūrya Ṣaṣṭhī (Chhath) 2017 falls on Thursday 26 October. Ṣaṣṭhī runs from 12:08 on Wed 25 Oct to 14:46 on Thu 26 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2017/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 26 Oct
Ahargaṇa, classicalDisc centre, no refractionThu 26 Oct
compat-drikpanchangComparison profileThu 26 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 25thCoveredMadhyāhna 26thCoveredRuled
Los Angeles21:08 → 23:4612:1348 min12:130 min25 Oct
Chicago23:08 → 01:4612:1048 min12:100 min25 Oct
Jersey City00:08 → 02:4612:1648 min12:160 min25 Oct
Port of Spain00:08 → 02:4611:2648 min11:260 min25 Oct
London05:08 → 07:4612:2048 min12:200 min25 Oct
Durban06:08 → 08:4611:1648 min11:160 min25 Oct
Dubai08:08 → 10:4611:3948 min11:390 min25 Oct
Delhi09:38 → 12:1611:4148 min11:4135 min25 Oct
Kolkata09:38 → 12:1610:5648 min10:5648 min25 Oct
Singapore12:08 → 14:4612:2548 min12:2548 min25 Oct
Sydney15:08 → 17:4612:160 min12:1548 min26 Oct
Suva16:08 → 18:4611:270 min11:2648 min26 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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