Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1913

Tuesday 4 November

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 03 s away. 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 Monday 3 November

Ṣaṣṭhī is absent from madhyāhna. Not taken.

madhyāhna begins 11:38  12:26 madhyāhna ends
Ṣaṣṭhī begins 12:29:36
10:5011:1411:3812:0212:2612:5013:14

0 of 48 minutes covered

Midday of Tuesday 4 November

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 11:38  12:26 madhyāhna ends
Ṣaṣṭhī ends 12:42:32
10:5011:1411:3812:0212:2612:5013:14

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 12:30 on Mon 3 Nov to 12:43 on Tue 4 Nov.

    1913-11-03T04:29:36Z → 1913-11-04T04:42:33Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 3rd, 11:38–12:26 on the 4th.

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

  3. 03

    Rule

    Ṣaṣṭhī 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. 104

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 243 s < 300 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Baoding, 1913: Tuesday 4 November.

    confidence: boundary (margin)

Say it like this

In Baoding, Sūrya Ṣaṣṭhī (Chhath) 1913 falls on Tuesday 4 November. Ṣaṣṭhī runs from 12:30 on Mon 3 Nov to 12:43 on Tue 4 Nov and covers all of madhyāhna that midday. It is 4 min 03 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1913/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 4 Nov
Ahargaṇa, classicalDisc centre, no refractionTue 4 Nov
compat-drikpanchangComparison profileTue 4 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 3rdCoveredMadhyāhna 4thCoveredRuled
Los Angeles20:30 → 20:4311:1248 min11:120 min3 Nov
Chicago22:30 → 22:4311:1048 min11:100 min3 Nov
Jersey City23:30 → 23:4311:1648 min11:160 min3 Nov
Port of Spain00:30 → 00:4311:2648 min11:260 min3 Nov
London04:30 → 04:4311:2048 min11:200 min3 Nov
Durban06:30 → 06:4311:1648 min11:160 min3 Nov
Dubai08:11 → 08:2411:1948 min11:190 min3 Nov
Delhi10:00 → 10:1311:4148 min11:410 min3 Nov
Kolkata10:00 → 10:1310:5648 min10:560 min3 Nov
Singapore11:30 → 11:4311:2443 min11:2418 min3 Nov
Sydney14:30 → 14:4311:150 min11:1548 min4 Nov
Suva16:25 → 16:3811:210 min11:2148 min4 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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