Ruling · Rādhāṣṭamī · 2021

Tuesday 14 September

Determinatein Mashhad, under the Rashtriya Panchang method. Clear of every threshold by 6 min 55 s.

Decide it for

MashhadDelhiKolkataSingaporeSydneyJersey City

36°18′ N 59°36′ E · Asia/Tehran · GeoNames 124665

The two middays

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

Midday of Monday 13 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 12:03  12:51 madhyāhna ends
11:1511:3912:0312:2712:5113:1513:39

0 of 48 minutes covered

Midday of Tuesday 14 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 12:03  12:51 madhyāhna ends
Aṣṭamī ends 12:09:45
11:1511:3912:0312:2712:5113:1513:39

7 of 48 minutes covered, the first 7

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

How it was decided

  1. 01

    Aṅga

    Aṣṭamī runs from 14:11 on Mon 13 Sep to 12:10 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: 12:03–12:51 on the 13th, 12:03–12:51 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 0 of 48 minutes on the 13th and 7 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 415 s

  5. 05

    Ruling

    Rādhāṣṭamī, Mashhad, 2021: Tuesday 14 September.

    confidence: determinate

Say it like this

In Mashhad, Rādhāṣṭamī 2021 falls on Tuesday 14 September. Aṣṭamī runs from 14:11 on Mon 13 Sep to 12:10 on Tue 14 Sep and covers 7 of 48 minutes of madhyāhna that midday.

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

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 14 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 14 Sep
compat-drikpanchangComparison profileTue 14 Sep
No institution has a recorded ruling for Mashhad.

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

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