Ruling · Rādhāṣṭamī · 1911

Thursday 31 August

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 31 August

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

madhyāhna begins 11:54  12:42 madhyāhna ends
Aṣṭamī begins 11:12:53
11:0611:3011:5412:1812:4213:0613:30

48 of 48 minutes covered

Midday of Friday 1 September

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:54  12:42 madhyāhna ends
11:0611:3011:5412:1812:4213:0613:30

48 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 11:13 on Thu 31 Aug to 13:32 on Fri 1 Sep.

    1911-08-31T03:12:54Z → 1911-09-01T05:31:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:54–12:42 on the 31st, 11:54–12:42 on the 1st.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 48 of 48 minutes on the 31st and 48 of 48 on the 1st.

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

  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 2494 s

  5. 05

    Ruling

    Rādhāṣṭamī, Baoding, 1911: Thursday 31 August.

    confidence: boundary (tie-break-unstated)

Say it like this

In Baoding, Rādhāṣṭamī 1911 falls on Thursday 31 August. Aṣṭamī runs from 11:13 on Thu 31 Aug to 13:32 on Fri 1 Sep 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/1911/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 31 Aug
Ahargaṇa, classicalDisc centre, no refractionThu 31 Aug
compat-drikpanchangComparison profileFri 1 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/radhashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 31stCoveredMadhyāhna 1stCoveredRuled
Los Angeles19:13 → 21:3211:2948 min11:290 min31 Aug
Chicago21:13 → 23:3211:2748 min11:260 min31 Aug
Jersey City22:13 → 00:3211:3248 min11:320 min31 Aug
Port of Spain23:13 → 01:3211:4248 min11:420 min31 Aug
London03:13 → 05:3211:3748 min11:360 min31 Aug
Durban05:13 → 07:3211:3348 min11:320 min31 Aug
Dubai06:54 → 09:1311:3648 min11:360 min31 Aug
Delhi08:43 → 11:0211:5748 min11:570 min31 Aug
Kolkata08:43 → 11:0211:1348 min11:130 min31 Aug
Singapore10:13 → 12:3211:4148 min11:4148 min31 Aug
Sydney13:13 → 15:3211:320 min11:3248 min1 Sep
Suva15:08 → 17:2711:380 min11:3848 min1 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
radhashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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