Ruling · Caitrī Pūrṇimā · 1987

Monday 13 April

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 25 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 Monday 13 April

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 12:55  13:43 madhyāhna ends
Pūrṇimā begins 12:30:10
12:0712:3112:5513:1913:4314:0714:31

48 of 48 minutes covered

Midday of Tuesday 14 April

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 12:55  13:43 madhyāhna ends
12:0712:3112:5513:1913:4314:0714:31

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 12:30 on Mon 13 Apr to 11:31 on Tue 14 Apr.

    1987-04-13T03:30:10Z → 1987-04-14T02:30:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:55–13:43 on the 13th, 12:55–13:43 on the 14th.

    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 13th and 0 of 48 on the 14th.

    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 1504 s

  5. 05

    Ruling

    Caitrī Pūrṇimā, Baoding, 1987: Monday 13 April.

    confidence: determinate

Say it like this

In Baoding, Caitrī Pūrṇimā 1987 falls on Monday 13 April. Pūrṇimā runs from 12:30 on Mon 13 Apr to 11:31 on Tue 14 Apr and covers all of madhyāhna that midday.

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

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 13 Apr
Ahargaṇa, classicalDisc centre, no refractionMon 13 Apr
compat-drikpanchangComparison profileMon 13 Apr
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/chaitri-purnima · ruleset 2026.3-draft

Month
Caitra, amānta
Pakṣa · aṅga
Śukla · Pūrṇimā
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 102

“S 15 Caitri purnima (paraviddha), Hanumat jayanti, Oli ending (Jain).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāMadhyāhna 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles20:30 → 19:3112:3048 min12:300 min13 Apr
Chicago22:30 → 21:3112:2848 min12:270 min13 Apr
Jersey City23:30 → 22:3112:3348 min12:330 min13 Apr
Port of Spain23:30 → 22:3111:4348 min11:430 min13 Apr
London04:30 → 03:3112:3848 min12:370 min13 Apr
Durban05:30 → 04:3111:3248 min11:320 min13 Apr
Dubai07:30 → 06:3111:5648 min11:550 min13 Apr
Delhi09:00 → 08:0111:5848 min11:580 min13 Apr
Kolkata09:00 → 08:0111:1348 min11:130 min13 Apr
Singapore11:30 → 10:3112:4148 min12:410 min13 Apr
Sydney13:30 → 12:3111:320 min11:3148 min14 Apr
Suva15:30 → 14:3111:430 min11:4348 min14 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
chaitri-purnima@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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