Ruling · Śītalāṣṭamī · 1981

Saturday 28 March

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 6 min 53 s.

Decide it for

TehranDelhiKolkataSingaporeSydneyJersey City

35°42′ N 51°25′ E · Asia/Tehran · GeoNames 112931

The two middays

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

Midday of Saturday 28 March

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:46  12:34 madhyāhna ends
10:5811:2211:4612:1012:3412:5813:22

48 of 48 minutes covered

Midday of Sunday 29 March

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:45  12:33 madhyāhna ends
Aṣṭamī ends 11:38:33
10:5711:2111:4512:0912:3312:5713:21

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 10:20 on Sat 28 Mar to 11:39 on Sun 29 Mar.

    1981-03-28T06:49:37Z → 1981-03-29T08:08:33Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:46–12:34 on the 28th, 11:45–12:33 on the 29th.

    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 28th and 0 of 48 on the 29th.

    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 413 s

  5. 05

    Ruling

    Śītalāṣṭamī, Tehran, 1981: Saturday 28 March.

    confidence: determinate

Say it like this

In Tehran, Śītalāṣṭamī 1981 falls on Saturday 28 March. Aṣṭamī runs from 10:20 on Sat 28 Mar to 11:39 on Sun 29 Mar and covers all of madhyāhna that midday.

ahargana.org/tehran/festivals/1981/shitalashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 28 Mar
Ahargaṇa, classicalDisc centre, no refractionSat 28 Mar
compat-drikpanchangComparison profileSat 28 Mar
No institution has a recorded ruling for Tehran.

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 28thCoveredMadhyāhna 29thCoveredRuled
Los Angeles22:50 → 00:0911:3448 min11:340 min28 Mar
Chicago00:50 → 02:0911:3248 min11:320 min28 Mar
Jersey City01:50 → 03:0911:3848 min11:370 min28 Mar
Port of Spain02:50 → 04:0911:4748 min11:470 min28 Mar
London06:50 → 09:0911:4248 min12:420 min28 Mar
Durban08:50 → 10:0911:3748 min11:360 min28 Mar
Dubai10:50 → 12:0912:0048 min12:009 min28 Mar
Delhi12:20 → 13:3912:0231 min12:0248 min28 Mar
Kolkata12:20 → 13:3911:180 min11:1848 min29 Mar
Singapore14:20 → 15:3912:160 min12:1548 min29 Mar
Sydney16:50 → 18:0911:360 min11:3648 min29 Mar
Suva18:50 → 20:0911:470 min11:4748 min29 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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