Ruling · Śivarātri (Masik Shivaratri) · 2026

Tuesday 11 August

Determinatein Ujjain, under the Rashtriya Panchang method. Clear of every threshold by 58 minutes.

Decide it for

UjjainDelhiKolkataSingaporeSydneyJersey City

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

The two nights

One ghaṭī is 24 minutes. Niśītha is 1 ghaṭikā either side of midnight.

Night of Monday 10 August

Caturdaśī is absent from niśītha. Not taken.

niśītha begins 00:08  00:56 niśītha ends
23:2023:4400:0800:3200:5601:2001:44

0 of 48 minutes covered

Night of Tuesday 11 August

Taken. The only night Caturdaśī reaches.

niśītha begins 00:08  00:56 niśītha ends
23:2023:4400:0800:3200:5601:2001:44

48 of 48 minutes covered

Caturdaśī presentNiśītha, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Caturdaśī runs from 04:55 on Tue 11 Aug to 01:54 on Wed 12 Aug.

    2026-08-10T23:24:44Z → 2026-08-11T20:23:45Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 00:08–00:56 on the 10th, 00:08–00:56 on the 11th.

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

  3. 03

    Rule

    Caturdaśī must be present during niśītha. It covers 0 of 48 minutes on the 10th and 48 of 48 on the 11th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 3453 s

  5. 05

    Ruling

    Śivarātri, Ujjain, 2026: Tuesday 11 August.

    confidence: determinate

Say it like this

In Ujjain, Śivarātri (Masik Shivaratri) 2026 falls on Tuesday 11 August. Caturdaśī runs from 04:55 on Tue 11 Aug to 01:54 on Wed 12 Aug and covers all of niśītha that night.

ahargana.org/ujjain/festivals/2026/shivaratri?on=2026-08-11 · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 11 Aug
Ahargaṇa, classicalDisc centre, no refractionTue 11 Aug
compat-drikpanchangComparison profileTue 11 Aug
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/shivaratri · ruleset 2026.3-draft

Month
Every lunation
Pakṣa · aṅga
Kṛṣṇa · Caturdaśī
Kāla
Niśītha
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 108

“The krsna caturdasi in each month is called 'Sivaratri'. The chief among them is that of Magha. The tithi must cover nisitha (or pradosa in some opinion).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 108. The alternative opinion that reads pradoṣa instead of niśītha is not evaluated.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceCaturdaśīNiśītha 10thCoveredNiśītha 11thCoveredRuled
Los Angeles16:25 → 13:2400:3448 min00:340 min10 Aug
Chicago18:25 → 15:2400:3248 min00:320 min10 Aug
Jersey City19:25 → 16:2400:3848 min00:380 min10 Aug
Port of Spain19:25 → 16:2423:4748 min23:470 min10 Aug
London00:25 → 21:2400:4248 min00:420 min10 Aug
Durban01:25 → 22:2423:370 min23:370 min10 Aug
Dubai03:25 → 00:2400:000 min00:0024 min11 Aug
Delhi04:55 → 01:5400:030 min00:0248 min11 Aug
Kolkata04:55 → 01:5423:180 min23:1848 min11 Aug
Singapore07:25 → 04:2400:460 min00:4648 min11 Aug
Sydney09:25 → 06:2423:360 min23:3648 min11 Aug
Suva11:25 → 08:2423:480 min23:4748 min11 Aug
Profile · tradition
pac-rp@2026.1 · smarta
Rule
shivaratri@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s