Ruling · Mahāśivarātri (Shivratri) · 2011

Thursday 3 March

Boundaryin Daqing, under the Rashtriya Panchang method. A threshold is only 0 min 46 s away. Say “contested”.

Decide it for

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two nights

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

Night of Wednesday 2 March

Caturdaśī is absent from niśītha. Not taken.

niśītha begins 23:28  00:16 niśītha ends
Caturdaśī begins 00:16:29
22:4023:0423:2823:5200:1600:4001:04

0 of 48 minutes covered

Night of Thursday 3 March

Taken. The only night Caturdaśī reaches.

niśītha begins 23:28  00:16 niśītha ends
22:4023:0423:2823:5200:1600:4001:04

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 00:16 on Thu 3 Mar to 02:26 on Fri 4 Mar.

    2011-03-02T16:16:29Z → 2011-03-03T18:25:45Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 23:28–00:16 on the 2nd, 23:28–00:16 on the 3rd.

    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 2nd and 48 of 48 on the 3rd.

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

  4. 04

    Tie-break

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

    priority: disputed → only-day · margin 46 s < 300 s

  5. 05

    Ruling

    Mahāśivarātri, Daqing, 2011: Thursday 3 March.

    confidence: boundary (margin)

Say it like this

In Daqing, Mahāśivarātri (Shivratri) 2011 falls on Thursday 3 March. Caturdaśī runs from 00:16 on Thu 3 Mar to 02:26 on Fri 4 Mar and covers all of niśītha that night. It is 0 min 46 s from a threshold: treat the date as contested.

ahargana.org/daqing/festivals/2011/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 3 Mar
Ahargaṇa, classicalDisc centre, no refractionThu 3 Mar
compat-drikpanchangComparison profileThu 3 Mar
No institution has a recorded ruling for Daqing.

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

The rule, as data

/rules/maha-shivaratri · ruleset 2026.3-draft

Month
Māgha, amānta
Pakṣa · aṅga
Kṛṣṇa · Caturdaśī
Kāla
Niśītha
Priority
Disputed
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 105

“K 14 Mahasivaratri (nisithavyapini) — In some opinion it is to be observed on nisitha and in some opinion on pradosa. If occurs on two successive nisithas then according to Hemadri it is to be observed on the first day and according to Madhava, to be observed on the second day” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105. 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 2ndCoveredNiśītha 3rdCoveredRuled
Los Angeles08:16 → 10:2623:4148 min23:410 min2 Mar
Chicago10:16 → 12:2623:3848 min23:380 min2 Mar
Jersey City11:16 → 13:2623:4448 min23:440 min2 Mar
Port of Spain12:16 → 14:2623:5448 min23:540 min2 Mar
London16:16 → 18:2623:4848 min23:480 min2 Mar
Durban18:16 → 20:2623:4448 min23:440 min2 Mar
Dubai20:16 → 22:2600:0748 min00:060 min2 Mar
Delhi21:46 → 23:5600:0948 min00:090 min2 Mar
Kolkata21:46 → 23:5623:2548 min23:2431 min2 Mar
Singapore00:16 → 02:2600:5348 min00:5348 min2 Mar
Sydney03:16 → 05:2600:440 min00:4348 min3 Mar
Suva05:16 → 07:2600:550 min00:5448 min3 Mar
Profile · tradition
pac-rp@2026.1 · smarta
Rule
maha-shivaratri@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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