Ruling · Rāma Navamī · 1971

Sunday 4 April

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 4 min 48 s away. Say “contested”.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Saturday 3 April

Navamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:20  12:08 madhyāhna ends
Navamī begins 12:12:50
10:3210:5611:2011:4412:0812:3212:56

0 of 48 minutes covered

Midday of Sunday 4 April

Taken. The only midday Navamī reaches.

madhyāhna begins 11:20  12:08 madhyāhna ends
10:3210:5611:2011:4412:0812:3212:56

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Navamī runs from 12:13 on Sat 3 Apr to 13:40 on Sun 4 Apr.

    1971-04-03T04:12:50Z → 1971-04-04T05:39:41Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:20–12:08 on the 3rd, 11:20–12:08 on the 4th.

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

  3. 03

    Rule

    Navamī must be present during madhyāhna. It covers 0 of 48 minutes on the 3rd and 48 of 48 on the 4th.

    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: unstated → only-day · margin 288 s < 300 s

  5. 05

    Ruling

    Rāma Navamī, Daqing, 1971: Sunday 4 April.

    confidence: boundary (margin)

Say it like this

In Daqing, Rāma Navamī 1971 falls on Sunday 4 April. Navamī runs from 12:13 on Sat 3 Apr to 13:40 on Sun 4 Apr and covers all of madhyāhna that midday. It is 4 min 48 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/1971/rama-navami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 4 Apr
Ahargaṇa, classicalDisc centre, no refractionSun 4 Apr
compat-drikpanchangComparison profileSun 4 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/rama-navami · ruleset 2026.3-draft

Month
Caitra, amānta
Pakṣa · aṅga
Śukla · Navamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 102

“S 9 Ramanavami (madhyahnavyapini, special with Punarvasu naks.), Rama jayanti.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102. The row calls the day special when it falls with Punarvasu nakṣatra; the nakṣatra is not tested.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceNavamīMadhyāhna 3rdCoveredMadhyāhna 4thCoveredRuled
Los Angeles20:13 → 21:4011:3348 min11:320 min3 Apr
Chicago22:13 → 23:4011:3048 min11:300 min3 Apr
Jersey City23:13 → 00:4011:3648 min11:360 min3 Apr
Port of Spain00:13 → 01:4011:4648 min11:450 min3 Apr
London05:13 → 06:4012:4148 min12:400 min3 Apr
Durban06:13 → 07:4011:3548 min11:350 min3 Apr
Dubai08:13 → 09:4011:5848 min11:580 min3 Apr
Delhi09:43 → 11:1012:0148 min12:010 min3 Apr
Kolkata09:43 → 11:1011:1648 min11:160 min3 Apr
Singapore11:43 → 13:1012:1448 min12:1448 min3 Apr
Sydney14:13 → 15:4011:350 min11:3448 min4 Apr
Suva16:13 → 17:4011:460 min11:4648 min4 Apr
Profile · tradition
pac-rp@2026.1 · smarta
Rule
rama-navami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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