Ruling · Bhīṣma Dvādaśī · 2026

Thursday 29 January

Determinatein Chicago, under the Rashtriya Panchang method. Clear of every threshold by 554 minutes.

Decide it for

ChicagoDelhiKolkataSingaporeSydneyJersey City

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

The two middays

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

Midday of Thursday 29 January

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:40  12:28 madhyāhna ends
10:5211:1611:4012:0412:2812:5213:16

48 of 48 minutes covered

Midday of Friday 30 January

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:40  12:28 madhyāhna ends
10:5211:1611:4012:0412:2812:5213:16

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 02:26 on Thu 29 Jan to 23:40 on Thu 29 Jan.

    2026-01-29T08:25:39Z → 2026-01-30T05:39:38Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:40–12:28 on the 29th, 11:40–12:28 on the 30th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 29th and 0 of 48 on the 30th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 33259 s

  5. 05

    Ruling

    Bhīṣma Dvādaśī, Chicago, 2026: Thursday 29 January.

    confidence: determinate

Say it like this

In Chicago, Bhīṣma Dvādaśī 2026 falls on Thursday 29 January. Dvādaśī runs from 02:26 on Thu 29 Jan to 23:40 on Thu 29 Jan and covers all of madhyāhna that midday.

ahargana.org/chicago/festivals/2026/bhishma-dvadashi · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 29 Jan
Ahargaṇa, classicalDisc centre, no refractionThu 29 Jan
compat-drikpanchangComparison profileThu 29 Jan
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/bhishma-dvadashi · ruleset 2026.3-draft

Month
Māgha, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 105

“S 12 Bhisma dvadasi (purvaviddha), Amalaki dvadasi, Santana dvadasi, Varaha dvadasi” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 29thCoveredMadhyāhna 30thCoveredRuled
Los Angeles00:26 → 21:4011:4248 min11:420 min29 Jan
Chicago02:26 → 23:4011:4048 min11:400 min29 Jan
Jersey City03:26 → 00:4011:4648 min11:460 min29 Jan
Port of Spain04:26 → 01:4011:5548 min11:550 min29 Jan
London08:26 → 05:4011:5048 min11:500 min29 Jan
Durban10:26 → 07:4011:4548 min11:450 min29 Jan
Dubai12:26 → 09:4012:0830 min12:080 min29 Jan
Delhi13:56 → 11:1012:100 min12:100 min30 Jan
Kolkata13:56 → 11:1011:260 min11:260 min30 Jan
Singapore16:26 → 13:4012:540 min12:5446 min30 Jan
Sydney19:26 → 16:4012:440 min12:4448 min30 Jan
Suva20:26 → 17:4011:550 min11:5548 min30 Jan
Profile · tradition
pac-rp@2026.1 · smarta
Rule
bhishma-dvadashi@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s