Ruling · Rādhāṣṭamī · 2029

Saturday 15 September

Determinatein Ujjain, under the Rashtriya Panchang method. Clear of every threshold by 336 minutes.

Decide it for

UjjainDelhiKolkataSingaporeSydneyJersey City

23°11′ N 75°47′ E · Asia/Kolkata · GeoNames 1253914

The two middays

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

Midday of Friday 14 September

Aṣṭamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

0 of 48 minutes covered

Midday of Saturday 15 September

Taken. The only midday Aṣṭamī reaches.

madhyāhna begins 11:58  12:46 madhyāhna ends
11:1011:3411:5812:2212:4613:1013:34

48 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 19:45 on Fri 14 Sep to 18:22 on Sat 15 Sep.

    2029-09-14T14:14:42Z → 2029-09-15T12:52:10Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:58–12:46 on the 14th, 11:58–12:46 on the 15th.

    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 14th and 48 of 48 on the 15th.

    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 20176 s

  5. 05

    Ruling

    Rādhāṣṭamī, Ujjain, 2029: Saturday 15 September.

    confidence: determinate

Say it like this

In Ujjain, Rādhāṣṭamī 2029 falls on Saturday 15 September. Aṣṭamī runs from 19:45 on Fri 14 Sep to 18:22 on Sat 15 Sep and covers all of madhyāhna that midday.

ahargana.org/ujjain/festivals/2029/radhashtami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 15 Sep
Ahargaṇa, classicalDisc centre, no refractionSat 15 Sep
compat-drikpanchangComparison profileSat 15 Sep
No institution has a recorded ruling for Ujjain.

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 14thCoveredMadhyāhna 15thCoveredRuled
Los Angeles07:15 → 05:5212:2448 min12:240 min14 Sep
Chicago09:15 → 07:5212:2248 min12:210 min14 Sep
Jersey City10:15 → 08:5212:2748 min12:270 min14 Sep
Port of Spain10:15 → 08:5211:3748 min11:370 min14 Sep
London15:15 → 13:5212:310 min12:3148 min15 Sep
Durban16:15 → 14:5211:280 min11:2748 min15 Sep
Dubai18:15 → 16:5211:500 min11:5048 min15 Sep
Delhi19:45 → 18:2211:520 min11:5248 min15 Sep
Kolkata19:45 → 18:2211:080 min11:0848 min15 Sep
Singapore22:15 → 20:5212:360 min12:3648 min15 Sep
Sydney00:15 → 22:5211:270 min11:2748 min15 Sep
Suva02:15 → 00:5211:380 min11:3848 min15 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