Ruling · Guru Pūrṇimā · 1900

Thursday 12 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 553 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 11 July

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

0 of 48 minutes covered

Midday of Thursday 12 July

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:26  12:14 madhyāhna ends
10:3811:0211:2611:5012:1412:3813:02

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 23:25 on Wed 11 Jul to 21:27 on Thu 12 Jul.

    1900-07-11T15:19:52Z → 1900-07-12T13:21:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:26–12:14 on the 11th, 11:26–12:14 on the 12th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 0 of 48 minutes on the 11th and 48 of 48 on the 12th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: paraviddha → only-day · margin 33172 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 1900: Thursday 12 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 1900 falls on Thursday 12 July. Pūrṇimā runs from 23:25 on Wed 11 Jul to 21:27 on Thu 12 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1900/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 12 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 12 Jul
compat-drikpanchangComparison profileThu 12 Jul
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/guru-purnima · ruleset 2026.3-draft

Month
Āṣāḍha, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 102

“S 15 Guru purnima (paraviddha), Vyasa puja (paraviddha, 3 muhurtas after sunrise), Kokila vrata (sayahna vyapini). Siva sayanotsava (pradosavyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles07:20 → 05:2211:3448 min11:340 min11 Jul
Chicago09:20 → 07:2211:3248 min11:320 min11 Jul
Jersey City10:20 → 08:2211:3748 min11:370 min11 Jul
Port of Spain11:20 → 09:2211:4748 min11:470 min11 Jul
London15:20 → 13:2211:410 min11:4248 min12 Jul
Durban16:50 → 14:5211:070 min11:0748 min12 Jul
Dubai19:01 → 17:0311:410 min11:4148 min12 Jul
Delhi20:41 → 18:4311:530 min11:5348 min12 Jul
Kolkata20:41 → 18:4311:090 min11:0948 min12 Jul
Singapore22:15 → 20:1711:410 min11:4148 min12 Jul
Sydney01:20 → 23:2211:360 min11:3748 min12 Jul
Suva03:15 → 01:1711:420 min11:4348 min12 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
guru-purnima@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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