Ruling · Vijayā Daśamī (Dussehra) · 1991

Friday 18 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 27 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 17 October

Daśamī 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 Friday 18 October

Taken. The only midday Daśamī reaches.

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

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Daśamī runs from 17:18 on Thu 17 Oct to 19:17 on Fri 18 Oct.

    1991-10-17T09:17:38Z → 1991-10-18T11:16:35Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:01–11:49 on the 17th, 11:01–11:49 on the 18th.

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

  3. 03

    Rule

    Daśamī touches Śravaṇa in the day time on neither day, so the rest of the rule applies. Daśamī must be present during madhyāhna. It covers 0 of 48 minutes on the 17th and 48 of 48 on the 18th.

    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 1594 s

  5. 05

    Ruling

    Vijayā Daśamī, Daqing, 1991: Friday 18 October.

    confidence: determinate

Say it like this

In Daqing, Vijayā Daśamī (Dussehra) 1991 falls on Friday 18 October. Daśamī touches Śravaṇa in the day time on neither day, so madhyāhna decides. Daśamī runs from 17:18 on Thu 17 Oct to 19:17 on Fri 18 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1991/vijaya-dashami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 18 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 18 Oct
compat-drikpanchangComparison profileFri 18 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/vijaya-dashami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Daśamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
First
With Śravaṇa in the day time

“S 10 Vijaya dasami (In Bengal it is observed as paraviddha, covering one muhurta from sunrise. In other places, if it touches Sravana naksatra in the day time it is observed on that day), Sarasvati visarjana (to be observed in naksatra Sravana), Dasahara.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104. The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDaśamīMadhyāhna 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles02:18 → 04:1712:1448 min12:140 min17 Oct
Chicago04:18 → 06:1712:1248 min12:120 min17 Oct
Jersey City05:18 → 07:1712:1748 min12:170 min17 Oct
Port of Spain05:18 → 07:1711:2748 min11:270 min17 Oct
London10:18 → 12:1712:2248 min12:210 min17 Oct
Durban11:18 → 13:1711:1848 min11:1748 min17 Oct
Dubai13:18 → 15:1711:400 min11:4048 min17 Oct
Delhi14:48 → 16:4711:420 min11:4248 min17 Oct
Kolkata14:48 → 16:4710:580 min10:5848 min17 Oct
Singapore17:18 → 19:1712:260 min12:2648 min17 Oct
Sydney19:18 → 21:1711:170 min11:1748 min18 Oct
Suva21:18 → 23:1711:280 min11:2848 min18 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vijaya-dashami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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