Ruling · Guru Pūrṇimā · 1965

Tuesday 13 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 620 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 Tuesday 13 July

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

48 of 48 minutes covered

Midday of Wednesday 14 July

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

0 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 22:38 on Mon 12 Jul to 01:01 on Wed 14 Jul.

    1965-07-12T14:37:47Z → 1965-07-13T17:01:22Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 13th, 11:21–12:09 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 0 of 48 on the 14th.

    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 37203 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 1965: Tuesday 13 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 1965 falls on Tuesday 13 July. Pūrṇimā runs from 22:38 on Mon 12 Jul to 01:01 on Wed 14 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1965/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 13 Jul
Ahargaṇa, classicalDisc centre, no refractionTue 13 Jul
compat-drikpanchangComparison profileTue 13 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 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles07:38 → 10:0112:3448 min12:340 min12 Jul
Chicago09:38 → 12:0112:3248 min12:320 min12 Jul
Jersey City10:38 → 13:0112:3848 min12:3824 min13 Jul
Port of Spain10:38 → 13:0111:4848 min11:4848 min13 Jul
London15:38 → 18:0112:420 min12:4248 min13 Jul
Durban16:38 → 19:0111:370 min11:3848 min13 Jul
Dubai18:38 → 21:0112:000 min12:0048 min13 Jul
Delhi20:08 → 22:3112:020 min12:0348 min13 Jul
Kolkata20:08 → 22:3111:180 min11:1848 min13 Jul
Singapore22:08 → 00:3112:160 min12:1648 min13 Jul
Sydney00:38 → 03:0111:370 min11:3748 min13 Jul
Suva02:38 → 05:0111:480 min11:4848 min13 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

About Ahargaṇa