Ruling · Skanda Ṣaṣṭhī · 1921

Sunday 4 December

Boundaryin Phoenix, under the Rashtriya Panchang method. A threshold is only 2 min 33 s away. Say “contested”.

Decide it for

33°27′ N 112°04′ W · America/Phoenix · GeoNames 5308655

The two middays

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

Midday of Sunday 4 December

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

madhyāhna begins 11:55  12:43 madhyāhna ends
Ṣaṣṭhī begins 11:51:58
11:0711:3111:5512:1912:4313:0713:31

48 of 48 minutes covered

Midday of Monday 5 December

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:55  12:43 madhyāhna ends
11:0711:3111:5512:1912:4313:0713:31

48 of 48 minutes covered

Ṣaṣṭhī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Ṣaṣṭhī runs from 11:52 on Sun 4 Dec to 14:22 on Mon 5 Dec.

    1921-12-04T18:51:58Z → 1921-12-05T21:22:24Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:55–12:43 on the 4th, 11:55–12:43 on the 5th.

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

  3. 03

    Rule

    Ṣaṣṭhī must be present during madhyāhna. It covers 48 of 48 minutes on the 4th and 48 of 48 on the 5th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 153 s < 300 s

  5. 05

    Ruling

    Skanda Ṣaṣṭhī, Phoenix, 1921: Sunday 4 December.

    confidence: boundary (margin)

Say it like this

In Phoenix, Skanda Ṣaṣṭhī 1921 falls on Sunday 4 December. Ṣaṣṭhī runs from 11:52 on Sun 4 Dec to 14:22 on Mon 5 Dec and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken. It is 2 min 33 s from a threshold: treat the date as contested.

ahargana.org/phoenix/festivals/1921/skanda-shashthi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 4 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 4 Dec
compat-drikpanchangComparison profileSun 4 Dec
No institution has a recorded ruling for Phoenix.

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

The rule, as data

/rules/skanda-shashthi · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Ṣaṣṭhī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 6 Campa sasthi (Maharashtra) (paraviddha). (Special when combined with naksatra Satabhisaj, yoga Vyatipata and Sunday), Skanda sasthi (purvaviddha), Guha sasthi” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceṢaṣṭhīMadhyāhna 4thCoveredMadhyāhna 5thCoveredRuled
Los Angeles10:52 → 13:2211:1948 min11:2048 min4 Dec
Chicago12:52 → 15:2211:170 min11:1748 min5 Dec
Jersey City13:52 → 16:2211:220 min11:2348 min5 Dec
Port of Spain14:52 → 17:2211:320 min11:3348 min5 Dec
London18:52 → 21:2211:270 min11:2748 min5 Dec
Durban20:52 → 23:2211:220 min11:2348 min5 Dec
Dubai22:52 → 01:2211:450 min11:4548 min5 Dec
Delhi00:22 → 02:5211:470 min11:4848 min5 Dec
Kolkata00:22 → 02:5211:030 min11:0348 min5 Dec
Singapore01:52 → 04:2211:310 min11:3148 min5 Dec
Sydney04:52 → 07:2211:210 min11:2248 min5 Dec
Suva06:52 → 09:2211:320 min11:3348 min5 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
skanda-shashthi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa