Ruling · Guru Pūrṇimā · 1912

Monday 29 July

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 20 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Sunday 28 July

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 12:00  12:48 madhyāhna ends
11:1211:3612:0012:2412:4813:1213:36

48 of 48 minutes covered

Midday of Monday 29 July

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 12:00  12:48 madhyāhna ends
Pūrṇimā ends 12:27:51
11:1211:3612:0012:2412:4813:1213:36

28 of 48 minutes covered, the first 28

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 10:06 on Sun 28 Jul to 12:28 on Mon 29 Jul.

    1912-07-28T02:06:05Z → 1912-07-29T04:27:52Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:00–12:48 on the 28th, 12:00–12:48 on the 29th.

    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 28th and 28 of 48 on the 29th.

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

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 1219 s

  5. 05

    Ruling

    Guru Pūrṇimā, Baoding, 1912: Monday 29 July.

    confidence: determinate

Say it like this

In Baoding, Guru Pūrṇimā 1912 falls on Monday 29 July. Pūrṇimā runs from 10:06 on Sun 28 Jul to 12:28 on Mon 29 Jul and covers 28 of 48 minutes of madhyāhna that midday. It also reaches the previous midday for 48 minutes; by the rule the second midday is taken.

ahargana.org/baoding/festivals/1912/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 29 Jul
Ahargaṇa, classicalDisc centre, no refractionMon 29 Jul
compat-drikpanchangComparison profileMon 29 Jul
No institution has a recorded ruling for Baoding.

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 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles18:06 → 20:2811:3548 min11:350 min28 Jul
Chicago20:06 → 22:2811:3348 min11:330 min28 Jul
Jersey City21:06 → 23:2811:3848 min11:380 min28 Jul
Port of Spain22:06 → 00:2811:4848 min11:480 min28 Jul
London02:06 → 04:2811:4248 min11:420 min28 Jul
Durban04:06 → 06:2811:3848 min11:380 min28 Jul
Dubai05:47 → 08:0911:4248 min11:420 min28 Jul
Delhi07:36 → 09:5812:0348 min12:030 min28 Jul
Kolkata07:36 → 09:5811:1948 min11:190 min28 Jul
Singapore09:06 → 11:2811:4748 min11:470 min28 Jul
Sydney12:06 → 14:2811:3820 min11:3848 min29 Jul
Suva14:01 → 16:2311:440 min11:4448 min29 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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