Ruling · Rādhāṣṭamī · 2021

Monday 13 September

Determinatein Algiers, under the Rashtriya Panchang method. Clear of every threshold by 98 minutes.

Decide it for

AlgiersDelhiKolkataSingaporeSydneyJersey City

36°44′ N 3°05′ E · Africa/Algiers · GeoNames 2507480

The two middays

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

Midday of Monday 13 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:19  13:07 madhyāhna ends
11:3111:5512:1912:4313:0713:3113:55

48 of 48 minutes covered

Midday of Tuesday 14 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:19  13:07 madhyāhna ends
11:3111:5512:1912:4313:0713:3113:55

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 10:41 on Mon 13 Sep to 08:40 on Tue 14 Sep.

    2021-09-13T09:41:14Z → 2021-09-14T07:39:45Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 12:19–13:07 on the 13th, 12:19–13:07 on the 14th.

    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 13th and 0 of 48 on the 14th.

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

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 5878 s

  5. 05

    Ruling

    Rādhāṣṭamī, Algiers, 2021: Monday 13 September.

    confidence: determinate

Say it like this

In Algiers, Rādhāṣṭamī 2021 falls on Monday 13 September. Aṣṭamī runs from 10:41 on Mon 13 Sep to 08:40 on Tue 14 Sep and covers all of madhyāhna that midday.

ahargana.org/algiers/festivals/2021/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 13 Sep
Ahargaṇa, classicalDisc centre, no refractionMon 13 Sep
compat-drikpanchangComparison profileMon 13 Sep
No institution has a recorded ruling for Algiers.

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

The rule, as data

/rules/radhashtami · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Aṣṭamī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 8 Durvastami (purvaviddha — S 8 of saura Bhadra except Bengal), Mahalaksmi vratarambha, Radhastami (madhyahna vyapini)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceAṣṭamīMadhyāhna 13thCoveredMadhyāhna 14thCoveredRuled
Los Angeles02:41 → 00:4012:2448 min12:240 min13 Sep
Chicago04:41 → 02:4012:2248 min12:220 min13 Sep
Jersey City05:41 → 03:4012:2848 min12:270 min13 Sep
Port of Spain05:41 → 03:4011:3848 min11:370 min13 Sep
London10:41 → 08:4012:3248 min12:310 min13 Sep
Durban11:41 → 09:4011:2835 min11:280 min13 Sep
Dubai13:41 → 11:4011:500 min11:500 min14 Sep
Delhi15:11 → 13:1011:530 min11:5248 min14 Sep
Kolkata15:11 → 13:1011:080 min11:0848 min14 Sep
Singapore17:41 → 15:4012:370 min12:3648 min14 Sep
Sydney19:41 → 17:4011:270 min11:2748 min14 Sep
Suva21:41 → 19:4011:380 min11:3848 min14 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
radhashtami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa