Ruling · Mahāṣṭamī (Durga Ashtami) · 1980

Friday 17 October

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 677 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 Friday 17 October

Taken. The only midday Aṣṭamī reaches.

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

48 of 48 minutes covered

Midday of Saturday 18 October

Aṣṭamī 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

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 23:44 on Thu 16 Oct to 23:40 on Fri 17 Oct.

    1980-10-16T15:43:38Z → 1980-10-17T15:39:41Z

  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

    Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 17th and 0 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: paraviddha → only-day · margin 40645 s

  5. 05

    Ruling

    Mahāṣṭamī, Daqing, 1980: Friday 17 October.

    confidence: determinate

Say it like this

In Daqing, Mahāṣṭamī (Durga Ashtami) 1980 falls on Friday 17 October. Aṣṭamī runs from 23:44 on Thu 16 Oct to 23:40 on Fri 17 Oct and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1980/mahashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 17 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 17 Oct
compat-drikpanchangComparison profileFri 17 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/mahashtami · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 8 Mahastami (paraviddha)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 16thCoveredMadhyāhna 17thCoveredRuled
Los Angeles08:44 → 08:4012:1448 min12:140 min16 Oct
Chicago10:44 → 10:4012:1248 min12:120 min16 Oct
Jersey City11:44 → 11:4012:1848 min12:170 min16 Oct
Port of Spain11:44 → 11:4011:2832 min11:2712 min17 Oct
London16:44 → 16:4012:220 min12:2148 min17 Oct
Durban17:44 → 17:4011:180 min11:1748 min17 Oct
Dubai19:44 → 19:4011:400 min11:4048 min17 Oct
Delhi21:14 → 21:1011:420 min11:4248 min17 Oct
Kolkata21:14 → 21:1010:580 min10:5848 min17 Oct
Singapore23:14 → 23:1011:560 min11:5648 min17 Oct
Sydney01:44 → 01:4011:170 min11:1748 min17 Oct
Suva03:44 → 03:4011:280 min11:2848 min17 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mahashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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