Ruling · Guru Pūrṇimā · 2021

Saturday 24 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 45 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 Friday 23 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 Saturday 24 July

Taken. Pūrṇimā reaches neither midday; the rule takes the second day.

madhyāhna begins 11:22  12:10 madhyāhna ends
Pūrṇimā ends 10:36:54
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 13:14 on Fri 23 Jul to 10:37 on Sat 24 Jul.

    2021-07-23T05:13:49Z → 2021-07-24T02:36:55Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:22–12:10 on the 23rd, 11:22–12:10 on the 24th.

    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 23rd and 0 of 48 on the 24th.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: paraviddha → second-day · margin 2716 s

  5. 05

    Ruling

    Guru Pūrṇimā, Daqing, 2021: Saturday 24 July.

    confidence: determinate

Say it like this

In Daqing, Guru Pūrṇimā 2021 falls on Saturday 24 July. Pūrṇimā runs from 13:14 on Fri 23 Jul to 10:37 on Sat 24 Jul, and reaches madhyāhna on neither day.

ahargana.org/daqing/festivals/2021/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 24 Jul
Ahargaṇa, classicalDisc centre, no refractionSat 24 Jul
compat-drikpanchangComparison profileSat 24 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 23rdCoveredMadhyāhna 24thCoveredRuled
Los Angeles22:14 → 19:3712:3548 min12:350 min23 Jul
Chicago00:14 → 21:3712:3348 min12:330 min23 Jul
Jersey City01:14 → 22:3712:3948 min12:390 min23 Jul
Port of Spain01:14 → 22:3711:4948 min11:490 min23 Jul
London06:14 → 03:3712:4348 min12:430 min23 Jul
Durban07:14 → 04:3711:3948 min11:390 min23 Jul
Dubai09:14 → 06:3712:0148 min12:010 min23 Jul
Delhi10:44 → 08:0712:0348 min12:030 min23 Jul
Kolkata10:44 → 08:0711:1948 min11:190 min23 Jul
Singapore13:14 → 10:3712:4721 min12:470 min23 Jul
Sydney15:14 → 12:3711:380 min11:3848 min24 Jul
Suva17:14 → 14:3711:490 min11:4948 min24 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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