Ruling · Sūrya Ṣaṣṭhī (Bhādrapada) · 1964

Saturday 12 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 2 min 18 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 Friday 11 September

Qualifies with 46 of 48 minutes. Not taken.

madhyāhna begins 11:50  12:38 madhyāhna ends
Ṣaṣṭhī begins 11:52:48
11:0211:2611:5012:1412:3813:0213:26

46 of 48 minutes covered, the last 46

Midday of Saturday 12 September

Taken. Both middays qualify; the rule takes the second.

madhyāhna begins 11:50  12:38 madhyāhna ends
11:0211:2611:5012:1412:3813:0213:26

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 11:53 on Fri 11 Sep to 13:46 on Sat 12 Sep.

    1964-09-11T03:52:48Z → 1964-09-12T05:45:54Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:50–12:38 on the 11th, 11:50–12:38 on the 12th.

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

  3. 03

    Rule

    Ṣaṣṭhī must be present during madhyāhna. It covers 46 of 48 minutes on the 11th and 48 of 48 on the 12th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

    Both middays qualify. Paraviddhā: the second is taken.

    priority: paraviddha → paraviddha · margin 138 s < 300 s

  5. 05

    Ruling

    Sūrya Ṣaṣṭhī (Bhādrapada), Baoding, 1964: Saturday 12 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Sūrya Ṣaṣṭhī (Bhādrapada) 1964 falls on Saturday 12 September. Ṣaṣṭhī runs from 11:53 on Fri 11 Sep to 13:46 on Sat 12 Sep and covers all of madhyāhna that midday. It also reaches the previous midday for 46 minutes; by the rule the second midday is taken. It is 2 min 18 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1964/surya-shashthi-bhadrapada · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 12 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 12 Sep
compat-drikpanchangComparison profileSat 12 Sep
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-bhadrapada · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Ṣaṣṭhī
Kāla
Madhyāhna
Priority
Paraviddhā
Tie-break
Second day
Reference
CRC 1955, p. 103

“S 6 Surya sasthi (paraviddha), Lolarka sasthi” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMadhyāhna 11thCoveredMadhyāhna 12thCoveredRuled
Los Angeles20:53 → 22:4612:2548 min12:250 min11 Sep
Chicago22:53 → 00:4612:2348 min12:220 min11 Sep
Jersey City23:53 → 01:4612:2848 min12:280 min11 Sep
Port of Spain23:53 → 01:4611:3948 min11:380 min11 Sep
London04:53 → 06:4612:3348 min12:320 min11 Sep
Durban05:53 → 07:4611:2948 min11:280 min11 Sep
Dubai07:53 → 09:4611:5148 min11:510 min11 Sep
Delhi09:23 → 11:1611:5348 min11:530 min11 Sep
Kolkata09:23 → 11:1611:0948 min11:097 min12 Sep
Singapore11:23 → 13:1612:0748 min12:0748 min12 Sep
Sydney13:53 → 15:4611:280 min11:2848 min12 Sep
Suva15:53 → 17:4611:390 min11:3948 min12 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
surya-shashthi-bhadrapada@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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