Ruling · Candra Ṣaṣṭhī · 2000

Monday 18 September

Determinatein Tehran, under the Rashtriya Panchang method. Clear of every threshold by 8 min 46 s.

Decide it for

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

The two moonrises

One ghaṭī is 24 minutes. The moonrise is read as disc centre, 31′.

Moonrise of Monday 18 September

Taken. The only moonrise Ṣaṣṭhī holds at.

22:09 moonrise
Ṣaṣṭhī begins 22:00:38
20:5721:2121:4522:0922:3322:5723:21

Holds at moonrise

Moonrise of Tuesday 19 September

Ṣaṣṭhī does not hold at moonrise. Not taken.

22:52 moonrise
21:4022:0422:2822:5223:1623:4000:04

Absent at moonrise

Ṣaṣṭhī presentMoonrise, the instant the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 22:01 on Mon 18 Sep to 20:35 on Tue 19 Sep.

    2000-09-18T17:30:38Z → 2000-09-19T16:05:14Z

  2. 02

    Kāla

    Moonrise is at 22:09 on the 18th and 22:52 on the 19th.

    moonrise: disc centre, 31′

  3. 03

    Rule

    Ṣaṣṭhī must be current at moonrise. It is on the 18th and is not on the 19th.

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

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 526 s

  5. 05

    Ruling

    Candra Ṣaṣṭhī, Tehran, 2000: Monday 18 September.

    confidence: determinate

Say it like this

In Tehran, Candra Ṣaṣṭhī 2000 falls on Monday 18 September. Ṣaṣṭhī runs from 22:01 on Mon 18 Sep to 20:35 on Tue 19 Sep and is current at moonrise that day.

ahargana.org/tehran/festivals/2000/chandra-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 18 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 18 Sep
compat-drikpanchangComparison profileMon 18 Sep
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/chandra-shashthi · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Kṛṣṇa · Ṣaṣṭhī
Kāla
Moonrise
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 103

“K 6 Candra sasthi (Sasthi current at moon-rise, if occurs on two successive days, it is to be observed on the first day).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMoonrise 18thCoveredMoonrise 19thCoveredRuled
Los Angeles10:31 → 09:0522:20holds23:06no18 Sep
Chicago12:31 → 11:0521:59holds22:41no18 Sep
Jersey City13:31 → 12:0522:06holds22:48no18 Sep
Port of Spain13:31 → 12:0522:01holds22:53no18 Sep
London18:31 → 17:0521:35holds22:09no18 Sep
Durban19:31 → 18:0522:29holds23:32no18 Sep
Dubai21:31 → 20:0521:39holds22:26no18 Sep
Delhi23:01 → 21:3521:34no22:19no18 Sep
Kolkata23:01 → 21:3520:56no21:43no18 Sep
Singapore01:31 → 00:0522:47no23:40holds19 Sep
Sydney04:31 → 03:0523:13no00:18holds19 Sep
Suva05:31 → 04:0521:59no22:57holds19 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
chandra-shashthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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