Ruling · Guru Pūrṇimā · 2079

Friday 14 July

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 3 min 05 s away. Say “contested”.

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 13 July

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:22  12:10 madhyāhna ends
10:3410:5811:2211:4612:1012:3412:58

48 of 48 minutes covered

Midday of Friday 14 July

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 11:22  12:10 madhyāhna ends
Pūrṇimā ends 11:25:02
10:3410:5811:2211:4612:1012:3412:58

3 of 48 minutes covered, the first 3

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 09:29 on Thu 13 Jul to 11:25 on Fri 14 Jul.

    2079-07-13T01:28:36Z → 2079-07-14T03:25:03Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 13th, 11:22–12:10 on the 14th.

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

  3. 03

    Rule

    Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 13th and 3 of 48 on the 14th.

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

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 185 s < 300 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 2079: Friday 14 July.

    confidence: boundary (margin)

Say it like this

In Daqing, Guru Pūrṇimā 2079 falls on Friday 14 July. Pūrṇimā runs from 09:29 on Thu 13 Jul to 11:25 on Fri 14 Jul and covers 3 of 48 minutes of madhyāhna that midday. It also reaches the previous midday for 48 minutes; by the rule the second midday is taken. It is 3 min 05 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/2079/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 14 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 14 Jul
compat-drikpanchangComparison profileFri 14 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 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles18:29 → 20:2512:3548 min12:350 min13 Jul
Chicago20:29 → 22:2512:3348 min12:330 min13 Jul
Jersey City21:29 → 23:2512:3848 min12:380 min13 Jul
Port of Spain21:29 → 23:2511:4848 min11:480 min13 Jul
London02:29 → 04:2512:4248 min12:420 min13 Jul
Durban03:29 → 05:2511:3848 min11:380 min13 Jul
Dubai05:29 → 07:2512:0148 min12:010 min13 Jul
Delhi06:59 → 08:5512:0348 min12:030 min13 Jul
Kolkata06:59 → 08:5511:1948 min11:190 min13 Jul
Singapore09:29 → 11:2512:4748 min12:470 min13 Jul
Sydney11:29 → 13:2511:3748 min11:3748 min14 Jul
Suva13:29 → 15:2511:480 min11:4948 min14 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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