Ruling · Guru Pūrṇimā · 1921

Tuesday 19 July

Determinatein Shaoxing, under the Rashtriya Panchang method. Clear of every threshold by 212 minutes.

Decide it for

ShaoxingDelhiKolkataSingaporeSydneyJersey City

30°00′ N 120°35′ E · Asia/Shanghai · GeoNames 1795855

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Tuesday 19 July

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:40  12:28 madhyāhna ends
10:5211:1611:4012:0412:2812:5213:16

48 of 48 minutes covered

Midday of Wednesday 20 July

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:40  12:28 madhyāhna ends
10:5211:1611:4012:0412:2812:5213:16

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 05:58 on Tue 19 Jul to 08:07 on Wed 20 Jul.

    1921-07-18T21:57:35Z → 1921-07-20T00:07:20Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:40–12:28 on the 19th, 11:40–12:28 on the 20th.

    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 19th and 0 of 48 on the 20th.

    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 12738 s

  5. 05

    Ruling

    Guru Pūrṇimā, Shaoxing, 1921: Tuesday 19 July.

    confidence: determinate

Say it like this

In Shaoxing, Guru Pūrṇimā 1921 falls on Tuesday 19 July. Pūrṇimā runs from 05:58 on Tue 19 Jul to 08:07 on Wed 20 Jul and covers all of madhyāhna that midday.

ahargana.org/shaoxing/festivals/1921/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 19 Jul
Ahargaṇa, classicalDisc centre, no refractionTue 19 Jul
compat-drikpanchangComparison profileTue 19 Jul
No institution has a recorded ruling for Shaoxing.

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 18thCoveredMadhyāhna 20thCoveredRuled
Los Angeles13:58 → 16:0711:350 min11:350 min19 Jul
Chicago16:58 → 19:0712:320 min12:320 min19 Jul
Jersey City17:58 → 20:0712:380 min12:380 min19 Jul
Port of Spain17:58 → 20:0711:480 min11:480 min19 Jul
London22:58 → 01:0712:420 min12:420 min19 Jul
Durban23:58 → 02:0711:380 min11:380 min19 Jul
Dubai01:58 → 04:0712:010 min12:010 min19 Jul
Delhi03:28 → 05:3712:030 min12:030 min19 Jul
Kolkata03:28 → 05:3711:180 min11:190 min19 Jul
Singapore04:58 → 07:0711:470 min11:470 min19 Jul
Sydney07:58 → 10:0711:370 min11:370 min19 Jul
Suva09:58 → 12:0711:480 min11:4819 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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