Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1947

Tuesday 18 November

Boundaryin Baoding, under the Rashtriya Panchang method. Both middays qualify and the rule does not say which to take. Say “contested”.

Decide it for

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 18 November

Taken. Both middays qualify; the rule is silent, and this one is covered longer.

madhyāhna begins 11:39  12:27 madhyāhna ends
Ṣaṣṭhī begins 11:32:05
10:5111:1511:3912:0312:2712:5113:15

48 of 48 minutes covered

Midday of Wednesday 19 November

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
10:5111:1511:3912:0312:2712:5113:15

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 11:32 on Tue 18 Nov to 14:04 on Wed 19 Nov.

    1947-11-18T03:32:05Z → 1947-11-19T06:04:22Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 18th, 11:39–12:27 on the 19th.

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

  3. 03

    Rule

    Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 18th and 48 of 48 on the 19th.

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

  4. 04

    Tie-break

    Both middays qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 413 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Baoding, 1947: Tuesday 18 November.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Sūrya Ṣaṣṭhī (Chhath) 1947 falls on Tuesday 18 November. Ṣaṣṭhī runs from 11:32 on Tue 18 Nov to 14:04 on Wed 19 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.

ahargana.org/baoding/festivals/1947/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 18 Nov
Ahargaṇa, classicalDisc centre, no refractionTue 18 Nov
compat-drikpanchangComparison profileWed 19 Nov
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/surya-shashthi · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Ṣaṣṭhī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 6 Nadi sasthi, Skanda sasthi (Madras), Surya sasthi, Chhat (Bihar).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMadhyāhna 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles19:32 → 22:0411:1448 min11:140 min18 Nov
Chicago21:32 → 00:0411:1248 min11:120 min18 Nov
Jersey City22:32 → 01:0411:1748 min11:170 min18 Nov
Port of Spain23:32 → 02:0411:2748 min11:270 min18 Nov
London03:32 → 06:0411:2148 min11:220 min18 Nov
Durban05:32 → 08:0411:1748 min11:170 min18 Nov
Dubai07:32 → 10:0411:4048 min11:400 min18 Nov
Delhi09:02 → 11:3411:4248 min11:420 min18 Nov
Kolkata09:02 → 11:3410:5748 min10:5837 min18 Nov
Singapore11:02 → 13:3411:5648 min11:5648 min18 Nov
Sydney13:32 → 16:0411:160 min11:1748 min19 Nov
Suva15:32 → 18:0411:270 min11:2848 min19 Nov
Profile · tradition
pac-rp@2026.1 · smarta
Rule
surya-shashthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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