Ruling · Guru Pūrṇimā · 1987

Saturday 11 July

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 27 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 Friday 10 July

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 12:59  13:47 madhyāhna ends
12:1112:3512:5913:2313:4714:1114:35

0 of 48 minutes covered

Midday of Saturday 11 July

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

madhyāhna begins 12:59  13:47 madhyāhna ends
Pūrṇimā ends 12:32:36
12:1112:3512:5913:2313:4714:1114:35

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 16:28 on Fri 10 Jul to 12:33 on Sat 11 Jul.

    1987-07-10T07:27:47Z → 1987-07-11T03:32:37Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:59–13:47 on the 10th, 12:59–13:47 on the 11th.

    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 10th and 0 of 48 on the 11th.

    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 1605 s

  5. 05

    Ruling

    Guru Pūrṇimā, Baoding, 1987: Saturday 11 July.

    confidence: determinate

Say it like this

In Baoding, Guru Pūrṇimā 1987 falls on Saturday 11 July. Pūrṇimā runs from 16:28 on Fri 10 Jul to 12:33 on Sat 11 Jul, and reaches madhyāhna on neither day.

ahargana.org/baoding/festivals/1987/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 11 Jul
Ahargaṇa, classicalDisc centre, no refractionSat 11 Jul
compat-drikpanchangComparison profileSat 11 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 10thCoveredMadhyāhna 11thCoveredRuled
Los Angeles00:28 → 20:3312:3448 min12:340 min10 Jul
Chicago02:28 → 22:3312:3248 min12:320 min10 Jul
Jersey City03:28 → 23:3312:3748 min12:380 min10 Jul
Port of Spain03:28 → 23:3311:4748 min11:470 min10 Jul
London08:28 → 04:3312:4148 min12:420 min10 Jul
Durban09:28 → 05:3311:3748 min11:370 min10 Jul
Dubai11:28 → 07:3312:0048 min12:000 min10 Jul
Delhi12:58 → 09:0312:020 min12:020 min11 Jul
Kolkata12:58 → 09:0311:180 min11:180 min11 Jul
Singapore15:28 → 11:3312:460 min12:460 min11 Jul
Sydney17:28 → 13:3311:360 min11:3748 min11 Jul
Suva19:28 → 15:3311:480 min11:4848 min11 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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