Ruling · Śītalāṣṭamī · 1940

Saturday 30 March

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 1 min 05 s away. Say “contested”.

Decide it for

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Saturday 30 March

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

madhyāhna begins 11:21  12:09 madhyāhna ends
Aṣṭamī begins 12:07:58
10:3310:5711:2111:4512:0912:3312:57

1 of 48 minutes covered, the last 1

Midday of Sunday 31 March

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
Aṣṭamī ends 12:42:11
10:3310:5711:2111:4512:0912:3312:57

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 12:08 on Sat 30 Mar to 12:42 on Sun 31 Mar.

    1940-03-30T04:07:59Z → 1940-03-31T04:42:12Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 30th, 11:21–12:09 on the 31st.

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

  3. 03

    Rule

    Aṣṭamī must be present during madhyāhna. It covers 1 of 48 minutes on the 30th and 48 of 48 on the 31st.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 65 s < 300 s

  5. 05

    Ruling

    Śītalāṣṭamī, Daqing, 1940: Saturday 30 March.

    confidence: boundary (margin)

Say it like this

In Daqing, Śītalāṣṭamī 1940 falls on Saturday 30 March. Aṣṭamī runs from 12:08 on Sat 30 Mar to 12:42 on Sun 31 Mar and covers 1 of 48 minutes of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 1 min 05 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/1940/shitalashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 30 Mar
Ahargaṇa, classicalDisc centre, no refractionSat 30 Mar
compat-drikpanchangComparison profileSat 30 Mar
No institution has a recorded ruling for Daqing.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/shitalashtami · ruleset 2026.3-draft

Month
Phālguna, amānta
Pakṣa · aṅga
Kṛṣṇa · Aṣṭamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 105

“K 8 Sitalastami, (purvaviddha)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 30thCoveredMadhyāhna 31stCoveredRuled
Los Angeles20:08 → 20:4211:3448 min11:330 min30 Mar
Chicago22:08 → 22:4211:3148 min11:310 min30 Mar
Jersey City23:08 → 23:4211:3748 min11:370 min30 Mar
Port of Spain00:08 → 00:4211:4748 min11:460 min30 Mar
London05:08 → 05:4212:4248 min12:410 min30 Mar
Durban06:08 → 06:4211:3648 min11:360 min30 Mar
Dubai08:08 → 08:4212:0048 min11:590 min30 Mar
Delhi09:38 → 10:1212:0248 min12:020 min30 Mar
Kolkata09:38 → 10:1211:1748 min11:170 min30 Mar
Singapore11:28 → 12:0212:0548 min12:050 min30 Mar
Sydney14:08 → 14:4211:360 min11:3548 min31 Mar
Suva16:08 → 16:4211:470 min11:4748 min31 Mar
Profile · tradition
pac-rp@2026.1 · smarta
Rule
shitalashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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