Ruling · Śītalāṣṭamī · 1978

Saturday 1 April

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 9 min 13 s.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

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 Friday 31 March

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
Aṣṭamī begins 12:18:00
10:3310:5711:2111:4512:0912:3312:57

0 of 48 minutes covered

Midday of Saturday 1 April

Taken. Aṣṭamī reaches neither midday; the rule takes the second day.

madhyāhna begins 11:20  12:08 madhyāhna ends
10:3210:5611:2011:4412:0812:3212:56

0 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 12:18 on Fri 31 Mar to 10:04 on Sat 1 Apr.

    1978-03-31T04:18:00Z → 1978-04-01T02:03:59Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 31st, 11:20–12:08 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 0 of 48 minutes on the 31st and 0 of 48 on the 1st.

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

  4. 04

    Tie-break

    Neither midday qualifies. The rule takes the second day.

    priority: purvaviddha → second-day · margin 553 s

  5. 05

    Ruling

    Śītalāṣṭamī, Daqing, 1978: Saturday 1 April.

    confidence: determinate

Say it like this

In Daqing, Śītalāṣṭamī 1978 falls on Saturday 1 April. Aṣṭamī runs from 12:18 on Fri 31 Mar to 10:04 on Sat 1 Apr, and reaches madhyāhna on neither day.

ahargana.org/daqing/festivals/1978/shitalashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 1 Apr
Ahargaṇa, classicalDisc centre, no refractionSat 1 Apr
compat-drikpanchangComparison profileFri 31 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 31stCoveredMadhyāhna 1stCoveredRuled
Los Angeles20:18 → 18:0411:3348 min11:330 min31 Mar
Chicago22:18 → 20:0411:3148 min11:310 min31 Mar
Jersey City23:18 → 21:0411:3748 min11:370 min31 Mar
Port of Spain00:18 → 22:0411:4648 min11:460 min31 Mar
London05:18 → 03:0412:4148 min12:410 min31 Mar
Durban06:18 → 04:0411:3648 min11:360 min31 Mar
Dubai08:18 → 06:0411:5948 min11:590 min31 Mar
Delhi09:48 → 07:3412:0248 min12:010 min31 Mar
Kolkata09:48 → 07:3411:1748 min11:170 min31 Mar
Singapore11:48 → 09:3412:1548 min12:150 min31 Mar
Sydney14:18 → 12:0411:350 min11:3529 min1 Apr
Suva16:18 → 14:0411:470 min11:4648 min1 Apr
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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