Ruling · Guru Pūrṇimā · 1913

Friday 18 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 65 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 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 18 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 13:15 on Thu 17 Jul to 14:06 on Fri 18 Jul.

    1913-07-17T05:14:40Z → 1913-07-18T06:05:58Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 17th, 11:22–12:10 on the 18th.

    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 17th and 48 of 48 on the 18th.

    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 3906 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 1913: Friday 18 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 1913 falls on Friday 18 July. Pūrṇimā runs from 13:15 on Thu 17 Jul to 14:06 on Fri 18 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1913/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 18 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 18 Jul
compat-drikpanchangComparison profileFri 18 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 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles21:15 → 22:0611:3548 min11:350 min17 Jul
Chicago23:15 → 00:0611:3248 min11:320 min17 Jul
Jersey City00:15 → 01:0611:3848 min11:380 min17 Jul
Port of Spain01:15 → 02:0611:4848 min11:480 min17 Jul
London05:15 → 06:0611:4248 min11:420 min17 Jul
Durban07:15 → 08:0611:3848 min11:380 min17 Jul
Dubai08:56 → 09:4711:4248 min11:420 min17 Jul
Delhi10:45 → 11:3612:0348 min12:030 min17 Jul
Kolkata10:45 → 11:3611:1848 min11:1818 min18 Jul
Singapore12:15 → 13:0611:4620 min11:4748 min18 Jul
Sydney15:15 → 16:0611:370 min11:3748 min18 Jul
Suva17:10 → 18:0111:430 min11:4348 min18 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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