Ruling · Gaṅgotpatti (Ganga Saptami) · 1902

Tuesday 13 May

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 58 s away. Say “contested”.

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 Tuesday 13 May

Taken. The only midday Saptamī reaches.

madhyāhna begins 11:51  12:39 madhyāhna ends
Saptamī begins 11:47:40
11:0311:2711:5112:1512:3913:0313:27

48 of 48 minutes covered

Midday of Wednesday 14 May

Saptamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:51  12:39 madhyāhna ends
11:0311:2711:5112:1512:3913:0313:27

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Saptamī runs from 11:48 on Tue 13 May to 10:12 on Wed 14 May.

    1902-05-13T03:47:40Z → 1902-05-14T02:11:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:51–12:39 on the 13th, 11:51–12:39 on the 14th.

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

  3. 03

    Rule

    Saptamī 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: purvaviddha → only-day · margin 178 s < 300 s

  5. 05

    Ruling

    Gaṅgotpatti, Baoding, 1902: Tuesday 13 May.

    confidence: boundary (margin)

Say it like this

In Baoding, Gaṅgotpatti (Ganga Saptami) 1902 falls on Tuesday 13 May. Saptamī runs from 11:48 on Tue 13 May to 10:12 on Wed 14 May and covers all of madhyāhna that midday. It is 2 min 58 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1902/gangotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 13 May
Ahargaṇa, classicalDisc centre, no refractionTue 13 May
compat-drikpanchangComparison profileTue 13 May
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/gangotpatti · ruleset 2026.3-draft

Month
Vaiśākha, amānta
Pakṣa · aṅga
Śukla · Saptamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 102

“S 7 Gangotpatti, (madhyahna vyapini, if occurs on two successive days, the first day is to be observed), Jahnu saptami, Sarkara saptami.” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSaptamīMadhyāhna 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles19:48 → 18:1211:2548 min11:250 min13 May
Chicago21:48 → 20:1211:2348 min11:230 min13 May
Jersey City22:48 → 21:1211:2948 min11:290 min13 May
Port of Spain23:48 → 22:1211:3848 min11:380 min13 May
London03:48 → 02:1211:3348 min11:330 min13 May
Durban05:18 → 03:4210:5848 min10:580 min13 May
Dubai07:29 → 05:5311:3248 min11:320 min13 May
Delhi09:09 → 07:3311:4448 min11:440 min13 May
Kolkata09:09 → 07:3311:0048 min11:000 min13 May
Singapore10:43 → 09:0711:3248 min11:320 min13 May
Sydney13:48 → 12:1211:270 min11:2745 min14 May
Suva15:43 → 14:0711:330 min11:3348 min14 May
Profile · tradition
pac-rp@2026.1 · smarta
Rule
gangotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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