Ruling · Śītalāṣṭamī · 2009

Thursday 19 March

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 21 minutes.

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 Wednesday 18 March

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:25  12:13 madhyāhna ends
Aṣṭamī begins 12:33:05
10:3711:0111:2511:4912:1312:3713:01

0 of 48 minutes covered

Midday of Thursday 19 March

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:24  12:12 madhyāhna ends
10:3611:0011:2411:4812:1212:3613:00

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 12:33 on Wed 18 Mar to 15:05 on Thu 19 Mar.

    2009-03-18T04:33:06Z → 2009-03-19T07:04:53Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:25–12:13 on the 18th, 11:24–12:12 on the 19th.

    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 18th and 48 of 48 on the 19th.

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

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 1234 s

  5. 05

    Ruling

    Śītalāṣṭamī, Daqing, 2009: Thursday 19 March.

    confidence: determinate

Say it like this

In Daqing, Śītalāṣṭamī 2009 falls on Thursday 19 March. Aṣṭamī runs from 12:33 on Wed 18 Mar to 15:05 on Thu 19 Mar and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/2009/shitalashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 19 Mar
Ahargaṇa, classicalDisc centre, no refractionThu 19 Mar
compat-drikpanchangComparison profileWed 18 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 18thCoveredMadhyāhna 19thCoveredRuled
Los Angeles21:33 → 00:0512:3748 min12:370 min18 Mar
Chicago23:33 → 02:0512:3548 min12:350 min18 Mar
Jersey City00:33 → 03:0512:4148 min12:400 min18 Mar
Port of Spain00:33 → 03:0511:5048 min11:500 min18 Mar
London04:33 → 07:0511:4548 min11:450 min18 Mar
Durban06:33 → 09:0511:4048 min11:390 min18 Mar
Dubai08:33 → 11:0512:0348 min12:030 min18 Mar
Delhi10:03 → 12:3512:0548 min12:0530 min18 Mar
Kolkata10:03 → 12:3511:2148 min11:2148 min18 Mar
Singapore12:33 → 15:0512:4948 min12:4848 min18 Mar
Sydney15:33 → 18:0512:390 min12:3948 min19 Mar
Suva16:33 → 19:0511:500 min11:5048 min19 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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