Ruling · Dyūta Pratipad · 2027

Friday 29 October

Boundaryin Chicago, under the Rashtriya Panchang method. Both forenoons qualify and the rule does not say which to take. Say “contested”.

Decide it for

41°51′ N 87°39′ W · America/Chicago · GeoNames 4887398

The two forenoons

One ghaṭī is 24 minutes. Pūrvāhṇa is first 5 of 15 day muhūrtas.

Forenoon of Friday 29 October

Taken. Both forenoons qualify; the rule is silent, and this one is covered longer.

07:19 sunrisepūrvāhṇa ends 10:49
Pratipadā begins 08:36:34
06:5507:4308:3109:1910:0710:55

133 of 210 minutes covered, the last 133

Forenoon of Saturday 30 October

Qualifies with 2 of 209 minutes. Not taken.

07:21 sunrisepūrvāhṇa ends 10:50
Pratipadā ends 07:22:22
06:5707:4508:3309:2110:0910:57

2 of 209 minutes covered, the first 2

Pratipadā presentPūrvāhṇa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pratipadā runs from 08:37 on Fri 29 Oct to 07:22 on Sat 30 Oct.

    2027-10-29T13:36:34Z → 2027-10-30T12:22:23Z

  2. 02

    Kāla

    Pūrvāhṇa is first 5 of 15 day muhūrtas: 07:19–10:49 on the 29th, 07:21–10:50 on the 30th.

    purvahna: day-muhurta-1-5 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pratipadā must be present during pūrvāhṇa. It covers 133 of 210 minutes on the 29th and 2 of 209 on the 30th.

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

  4. 04

    Tie-break

    Both forenoons qualify and the rule marks neither. The one covered longer is ruled, as a boundary.

    priority: unstated → greater-coverage · margin 101 s < 300 s

  5. 05

    Ruling

    Dyūta Pratipad, Chicago, 2027: Friday 29 October.

    confidence: boundary (margin, tie-break-unstated)

Say it like this

In Chicago, Dyūta Pratipad 2027 falls on Friday 29 October. Pratipadā runs from 08:37 on Fri 29 Oct to 07:22 on Sat 30 Oct and covers 133 of 210 minutes of pūrvāhṇa that forenoon. It also reaches the next forenoon for 2 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested. It is 1 min 41 s from a threshold: treat the date as contested.

ahargana.org/chicago/festivals/2027/dyuta-pratipad · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 29 Oct
Ahargaṇa, classicalDisc centre, no refractionFri 29 Oct
compat-drikpanchangComparison profileFri 29 Oct
No institution has a recorded ruling for Chicago.

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

The rule, as data

/rules/dyuta-pratipad · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Pratipadā
Kāla
Pūrvāhṇa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“S 1 Govardhana puja, Annakuta [purvaviddha], Balidaityaraja puja (pradosa), Dyuta pratipad (purvahna).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePratipadāSunrise 29thCoveredSunrise 30thCoveredRuled
Los Angeles06:37 → 05:2207:10218 min07:110 min29 Oct
Chicago08:37 → 07:2207:19133 min07:212 min29 Oct
Jersey City09:37 → 08:2207:2378 min07:2458 min29 Oct
Port of Spain09:37 → 08:2205:5716 min05:57145 min30 Oct
London14:37 → 13:2207:490 min07:50196 min30 Oct
Durban15:37 → 14:2205:050 min05:04264 min30 Oct
Dubai17:37 → 16:2206:240 min06:25225 min30 Oct
Delhi19:07 → 17:5206:310 min06:32222 min30 Oct
Kolkata19:07 → 17:5205:390 min05:40227 min30 Oct
Singapore21:37 → 20:2206:460 min06:46241 min30 Oct
Sydney00:37 → 23:2205:590 min05:58268 min30 Oct
Suva01:37 → 00:2205:290 min05:29254 min30 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dyuta-pratipad@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s