Ruling · Guru Pūrṇimā · 1902

Sunday 20 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 637 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 Sunday 20 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

Midday of Monday 21 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 23:02 on Sat 19 Jul to 00:45 on Mon 21 Jul.

    1902-07-19T15:01:32Z → 1902-07-20T16:45:02Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 20th, 11:22–12:10 on the 21st.

    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 20th and 0 of 48 on the 21st.

    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 38205 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 1902: Sunday 20 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 1902 falls on Sunday 20 July. Pūrṇimā runs from 23:02 on Sat 19 Jul to 00:45 on Mon 21 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1902/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 20 Jul
Ahargaṇa, classicalDisc centre, no refractionSun 20 Jul
compat-drikpanchangComparison profileSun 20 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 19thCoveredMadhyāhna 20thCoveredRuled
Los Angeles07:02 → 08:4511:3548 min11:350 min19 Jul
Chicago09:02 → 10:4511:3248 min11:320 min19 Jul
Jersey City10:02 → 11:4511:3848 min11:387 min20 Jul
Port of Spain11:02 → 12:4511:4848 min11:4848 min20 Jul
London15:02 → 16:4511:420 min11:4248 min20 Jul
Durban16:32 → 18:1511:080 min11:0848 min20 Jul
Dubai18:43 → 20:2611:420 min11:4248 min20 Jul
Delhi20:23 → 22:0611:540 min11:5448 min20 Jul
Kolkata20:23 → 22:0611:090 min11:1048 min20 Jul
Singapore21:57 → 23:4011:420 min11:4248 min20 Jul
Sydney01:02 → 02:4511:370 min11:3748 min20 Jul
Suva02:57 → 04:4011:430 min11:4348 min20 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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