Ruling · Navarātrārambha (Navratri) · 1921

Sunday 2 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 318 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 Saturday 1 October

Pratipadā is absent from madhyāhna. Not taken.

madhyāhna begins 11:44  12:32 madhyāhna ends
10:5611:2011:4412:0812:3212:5613:20

0 of 48 minutes covered

Midday of Sunday 2 October

Taken. The only midday Pratipadā reaches.

madhyāhna begins 11:43  12:31 madhyāhna ends
10:5511:1911:4312:0712:3112:5513:19

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pratipadā runs from 20:26 on Sat 1 Oct to 17:49 on Sun 2 Oct.

    1921-10-01T12:26:01Z → 1921-10-02T09:49:11Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:44–12:32 on the 1st, 11:43–12:31 on the 2nd.

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

  3. 03

    Rule

    Pratipadā must be present during madhyāhna. It covers 0 of 48 minutes on the 1st and 48 of 48 on the 2nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

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

    priority: paraviddha → only-day · margin 19065 s

  5. 05

    Ruling

    Navarātrārambha, Baoding, 1921: Sunday 2 October.

    confidence: determinate

Say it like this

In Baoding, Navarātrārambha (Navratri) 1921 falls on Sunday 2 October. Pratipadā runs from 20:26 on Sat 1 Oct to 17:49 on Sun 2 Oct and covers all of madhyāhna that midday.

ahargana.org/baoding/festivals/1921/navaratra-arambha · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 2 Oct
Ahargaṇa, classicalDisc centre, no refractionSun 2 Oct
compat-drikpanchangComparison profileSun 2 Oct
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/navaratra-arambha · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Śukla · Pratipadā
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 104

“S 1 Navaratrarambha (paraviddha).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePratipadāMadhyāhna 1stCoveredMadhyāhna 2ndCoveredRuled
Los Angeles04:26 → 01:4911:1848 min11:180 min1 Oct
Chicago07:26 → 04:4912:1648 min12:160 min1 Oct
Jersey City07:26 → 04:4911:2248 min11:210 min1 Oct
Port of Spain08:26 → 05:4911:3248 min11:310 min1 Oct
London13:26 → 10:4912:260 min12:260 min2 Oct
Durban14:26 → 11:4911:220 min11:2228 min2 Oct
Dubai16:26 → 13:4911:440 min11:4448 min2 Oct
Delhi17:56 → 15:1911:470 min11:4648 min2 Oct
Kolkata17:56 → 15:1911:020 min11:0248 min2 Oct
Singapore19:26 → 16:4911:300 min11:3048 min2 Oct
Sydney22:26 → 19:4911:210 min11:2148 min2 Oct
Suva00:26 → 21:4911:320 min11:3248 min2 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
navaratra-arambha@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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