April 1909 · each Moon as it stands at sunriseCaitra Śukla to Vaiśākha ŚuklaThe month ›

Ruling · 1909 · Daqing

Caitrī Pūrṇimā

Monday 5 April1909 · Daqing, Heilongjiang, China

Determinatemargin 411 min

In Daqing, under the Rashtriya Panchang method. Clear of every threshold by 411 minutes.

Decide it forDaqingDelhiKolkataSingaporeSydneyJersey City46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays मध्याह्न

One ghaṭī is 24 minutes

Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Monday 5 April

Taken. The only midday Pūrṇimā reaches.

madhyāhna begins 11:19  12:07 madhyāhna ends
10:3110:5511:1911:4312:0712:3112:55

48 of 48 minutes covered

Midday of Tuesday 6 April

Pūrṇimā is absent from madhyāhna. Not taken.

madhyāhna begins 11:19  12:07 madhyāhna ends
10:3110:5511:1911:4312:0712:3112:55

0 of 48 minutes covered

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

How it was decided निर्णय

  1. Step 1, Aṅga

    Pūrṇimā runs from 02:13 on Mon 5 Apr to 04:28 on Tue 6 Apr.

    1909-04-04T18:12:34Z → 1909-04-05T20:28:06Z
  2. Step 2, Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:19–12:07 on the 5th, 11:19–12:07 on the 6th.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′
  3. Step 3, Rule

    Pūrṇimā must be present during madhyāhna. It covers 48 of 48 minutes on the 5th and 0 of 48 on the 6th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102
  4. Step 4, Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: paraviddha → only-day · margin 24662 s
  5. Step 5, Ruling

    Caitrī Pūrṇimā, Daqing, 1909: Monday 5 April.

    confidence: determinate

Say it like this

In Daqing, Caitrī Pūrṇimā 1909 falls on Monday 5 April. Pūrṇimā runs from 02:13 on Mon 5 Apr to 04:28 on Tue 6 Apr and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1909/chaitri-purnimapac-rp@2026.1

Who says what

never edited to agree

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 5 Apr
Ahargaṇa, classicalDisc centre, no refractionMon 5 Apr
compat-drikpanchangComparison profileMon 5 Apr
No institution has a recorded ruling for Daqing.

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 clocks

PlacePūrṇimāMadhyāhna 4thCoveredMadhyāhna 5thCoveredRuled
Los Angeles10:13 → 12:2811:3248 min11:3248 min5 Apr
Chicago12:13 → 14:2811:306 min11:3048 min5 Apr
Jersey City13:13 → 15:2811:360 min11:3548 min5 Apr
Port of Spain14:13 → 16:2811:450 min11:4548 min5 Apr
London18:13 → 20:2811:400 min11:4048 min5 Apr
Durban20:13 → 22:2811:350 min11:3548 min5 Apr
Dubai21:54 → 00:0911:390 min11:3948 min5 Apr
Delhi23:43 → 01:5812:010 min12:0048 min5 Apr
Kolkata23:43 → 01:5811:160 min11:1648 min5 Apr
Singapore01:13 → 03:2811:440 min11:4448 min5 Apr
Sydney04:13 → 06:2811:340 min11:3448 min5 Apr
Suva06:08 → 08:2311:410 min11:4048 min5 Apr
This ruling as JSON · ICS
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