Ruling · Sūrya Ṣaṣṭhī (Chhath) · 1906

Tuesday 23 October

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 1 min 16 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 Monday 22 October

Ṣaṣṭhī is absent from madhyāhna. Not taken.

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

0 of 48 minutes covered

Midday of Tuesday 23 October

Taken. The only midday Ṣaṣṭhī reaches.

madhyāhna begins 11:38  12:26 madhyāhna ends
Ṣaṣṭhī ends 12:27:42
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 14:51 on Mon 22 Oct to 12:28 on Tue 23 Oct.

    1906-10-22T06:51:10Z → 1906-10-23T04:27:42Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 22nd, 11:38–12:26 on the 23rd.

    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 22nd and 48 of 48 on the 23rd.

    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 76 s < 300 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī, Baoding, 1906: Tuesday 23 October.

    confidence: boundary (margin)

Say it like this

In Baoding, Sūrya Ṣaṣṭhī (Chhath) 1906 falls on Tuesday 23 October. Ṣaṣṭhī runs from 14:51 on Mon 22 Oct to 12:28 on Tue 23 Oct and covers all of madhyāhna that midday. It is 1 min 16 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1906/surya-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 23 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 23 Oct
compat-drikpanchangComparison profileTue 23 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/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 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles22:51 → 20:2811:1348 min11:130 min22 Oct
Chicago00:51 → 22:2811:1148 min11:110 min22 Oct
Jersey City01:51 → 23:2811:1748 min11:170 min22 Oct
Port of Spain02:51 → 00:2811:2748 min11:260 min22 Oct
London06:51 → 04:2811:2148 min11:210 min22 Oct
Durban08:51 → 06:2811:1748 min11:170 min22 Oct
Dubai10:32 → 08:0911:2048 min11:200 min22 Oct
Delhi12:21 → 09:5811:428 min11:410 min22 Oct
Kolkata12:21 → 09:5810:570 min10:570 min23 Oct
Singapore13:51 → 11:2811:250 min11:253 min23 Oct
Sydney16:51 → 14:2811:160 min11:1648 min23 Oct
Suva18:46 → 16:2311:220 min11:2248 min23 Oct
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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