Ruling · Sūrya Ṣaṣṭhī (Chhath) · 2037

Thursday 12 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 Thursday 12 November

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

madhyāhna begins 11:38  12:26 madhyāhna ends
Ṣaṣṭhī begins 11:11:21
10:5011:1411:3812:0212:2612:5013:14

48 of 48 minutes covered

Midday of Friday 13 November

Qualifies with 6 of 48 minutes. Not taken.

madhyāhna begins 11:38  12:26 madhyāhna ends
Ṣaṣṭhī ends 11:44:37
10:5011:1411:3812:0212:2612:5013:14

6 of 48 minutes covered, the first 6

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

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 11:11 on Thu 12 Nov to 11:45 on Fri 13 Nov.

    2037-11-12T03:11:22Z → 2037-11-13T03:44:37Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:38–12:26 on the 12th, 11:38–12:26 on the 13th.

    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 12th and 6 of 48 on the 13th.

    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 383 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Baoding, 2037: Thursday 12 November.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Sūrya Ṣaṣṭhī (Chhath) 2037 falls on Thursday 12 November. Ṣaṣṭhī runs from 11:11 on Thu 12 Nov to 11:45 on Fri 13 Nov and covers all of madhyāhna that midday. It also reaches the next midday for 6 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/2037/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 12 Nov
Ahargaṇa, classicalDisc centre, no refractionThu 12 Nov
compat-drikpanchangComparison profileThu 12 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 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles19:11 → 19:4511:1348 min11:130 min12 Nov
Chicago21:11 → 21:4511:1148 min11:110 min12 Nov
Jersey City22:11 → 22:4511:1648 min11:160 min12 Nov
Port of Spain23:11 → 23:4511:2648 min11:260 min12 Nov
London03:11 → 03:4511:2048 min11:210 min12 Nov
Durban05:11 → 05:4511:1648 min11:160 min12 Nov
Dubai07:11 → 07:4511:3948 min11:390 min12 Nov
Delhi08:41 → 09:1511:4148 min11:410 min12 Nov
Kolkata08:41 → 09:1510:5748 min10:570 min12 Nov
Singapore11:11 → 11:4512:2548 min12:250 min12 Nov
Sydney14:11 → 14:4512:160 min12:1648 min13 Nov
Suva15:11 → 15:4511:270 min11:2748 min13 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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