Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1979

Saturday 27 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 9 min 26 s.

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 Friday 26 October

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 11:00  11:48 madhyāhna ends
Ṣaṣṭhī begins 12:02:18
10:1210:3611:0011:2411:4812:1212:36

0 of 48 minutes covered

Midday of Saturday 27 October

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 11:00  11:48 madhyāhna ends
Ṣaṣṭhī ends 11:09:05
10:1210:3611:0011:2411:4812:1212:36

9 of 48 minutes covered, the first 9

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

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 12:02 on Fri 26 Oct to 11:09 on Sat 27 Oct.

    1979-10-26T04:02:18Z → 1979-10-27T03:09:05Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:00–11:48 on the 26th, 11:00–11:48 on the 27th.

    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 26th and 9 of 48 on the 27th.

    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 566 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Daqing, 1979: Saturday 27 October.

    confidence: determinate

Say it like this

In Daqing, Sūrya Ṣaṣṭhī (Chhath) 1979 falls on Saturday 27 October. Ṣaṣṭhī runs from 12:02 on Fri 26 Oct to 11:09 on Sat 27 Oct and covers 9 of 48 minutes of madhyāhna that midday.

ahargana.org/daqing/festivals/1979/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 27 Oct
Ahargaṇa, classicalDisc centre, no refractionSat 27 Oct
compat-drikpanchangComparison profileSat 27 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 26thCoveredMadhyāhna 27thCoveredRuled
Los Angeles21:02 → 20:0912:1348 min12:130 min26 Oct
Chicago23:02 → 22:0912:1048 min12:100 min26 Oct
Jersey City00:02 → 23:0912:1648 min12:160 min26 Oct
Port of Spain00:02 → 23:0911:2648 min11:260 min26 Oct
London05:02 → 04:0912:2048 min12:200 min26 Oct
Durban06:02 → 05:0911:1648 min11:160 min26 Oct
Dubai08:02 → 07:0911:3948 min11:390 min26 Oct
Delhi09:32 → 08:3911:4148 min11:410 min26 Oct
Kolkata09:32 → 08:3910:5648 min10:560 min26 Oct
Singapore11:32 → 10:3911:5548 min11:550 min26 Oct
Sydney14:02 → 13:0911:160 min11:1548 min27 Oct
Suva16:02 → 15:0911:270 min11:2648 min27 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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