Ruling · Guru Pūrṇimā · 2011

Friday 15 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 150 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 14 July

Pūrṇimā is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Friday 15 July

Taken. The only midday Pūrṇimā reaches.

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

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 15:15 on Thu 14 Jul to 14:40 on Fri 15 Jul.

    2011-07-14T07:14:48Z → 2011-07-15T06:39:37Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 14th, 11:22–12:10 on the 15th.

    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 14th and 48 of 48 on the 15th.

    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 8998 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 2011: Friday 15 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 2011 falls on Friday 15 July. Pūrṇimā runs from 15:15 on Thu 14 Jul to 14:40 on Fri 15 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2011/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 15 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 15 Jul
compat-drikpanchangComparison profileFri 15 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 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles00:15 → 23:4012:3548 min12:350 min14 Jul
Chicago02:15 → 01:4012:3248 min12:320 min14 Jul
Jersey City03:15 → 02:4012:3848 min12:380 min14 Jul
Port of Spain03:15 → 02:4011:4848 min11:480 min14 Jul
London08:15 → 07:4012:4248 min12:420 min14 Jul
Durban09:15 → 08:4011:3848 min11:380 min14 Jul
Dubai11:15 → 10:4012:0148 min12:010 min14 Jul
Delhi12:45 → 12:1012:036 min12:037 min15 Jul
Kolkata12:45 → 12:1011:180 min11:1848 min15 Jul
Singapore15:15 → 14:4012:460 min12:4748 min15 Jul
Sydney17:15 → 16:4011:370 min11:3748 min15 Jul
Suva19:15 → 18:4011:480 min11:4848 min15 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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