Ruling · Guru Pūrṇimā · 1978

Thursday 20 July

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 55 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 Wednesday 19 July

Pūrṇimā is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Thursday 20 July

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

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

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 15:02 on Wed 19 Jul to 11:05 on Thu 20 Jul.

    1978-07-19T07:01:44Z → 1978-07-20T03:04:49Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:00–12:48 on the 19th, 12:00–12:48 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 0 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

    Neither midday qualifies. The rule takes the second day.

    priority: paraviddha → second-day · margin 3321 s

  5. 05

    Ruling

    Guru Pūrṇimā, Baoding, 1978: Thursday 20 July.

    confidence: determinate

Say it like this

In Baoding, Guru Pūrṇimā 1978 falls on Thursday 20 July. Pūrṇimā runs from 15:02 on Wed 19 Jul to 11:05 on Thu 20 Jul, and reaches madhyāhna on neither day.

ahargana.org/baoding/festivals/1978/guru-purnima · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 20 Jul
Ahargaṇa, classicalDisc centre, no refractionThu 20 Jul
compat-drikpanchangComparison profileThu 20 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 19thCoveredMadhyāhna 20thCoveredRuled
Los Angeles00:02 → 20:0512:3548 min12:350 min19 Jul
Chicago02:02 → 22:0512:3348 min12:330 min19 Jul
Jersey City03:02 → 23:0512:3848 min12:380 min19 Jul
Port of Spain03:02 → 23:0511:4848 min11:480 min19 Jul
London08:02 → 04:0512:4248 min12:420 min19 Jul
Durban09:02 → 05:0511:3848 min11:380 min19 Jul
Dubai11:02 → 07:0512:0148 min12:010 min19 Jul
Delhi12:32 → 08:3512:0319 min12:030 min19 Jul
Kolkata12:32 → 08:3511:190 min11:190 min20 Jul
Singapore14:32 → 10:3512:170 min12:170 min20 Jul
Sydney17:02 → 13:0511:370 min11:3848 min20 Jul
Suva19:02 → 15:0511:490 min11:4948 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

About Ahargaṇa