Ruling · Mahāśivarātri (Shivratri) · 1981

Wednesday 4 March

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 24 minutes.

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 4 March

Taken. The only night Caturdaśī reaches.

niśītha begins 23:27  00:15 niśītha ends
Caturdaśī begins 23:02:50
22:3923:0323:2723:5100:1500:3901:03

48 of 48 minutes covered

Night of Thursday 5 March

Caturdaśī is absent from niśītha. Not taken.

niśītha begins 23:27  00:15 niśītha ends
22:3923:0323:2723:5100:1500:3901:03

0 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 23:03 on Wed 4 Mar to 21:03 on Thu 5 Mar.

    1981-03-04T15:02:51Z → 1981-03-05T13:02:48Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 23:27–00:15 on the 4th, 23:27–00:15 on the 5th.

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

  3. 03

    Rule

    Caturdaśī must be present during niśītha. It covers 48 of 48 minutes on the 4th and 0 of 48 on the 5th.

    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 1467 s

  5. 05

    Ruling

    Mahāśivarātri, Daqing, 1981: Wednesday 4 March.

    confidence: determinate

Say it like this

In Daqing, Mahāśivarātri (Shivratri) 1981 falls on Wednesday 4 March. Caturdaśī runs from 23:03 on Wed 4 Mar to 21:03 on Thu 5 Mar and covers all of niśītha that night.

ahargana.org/daqing/festivals/1981/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 4 Mar
Ahargaṇa, classicalDisc centre, no refractionWed 4 Mar
compat-drikpanchangComparison profileWed 4 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 4thCoveredNiśītha 5thCoveredRuled
Los Angeles07:03 → 05:0323:4048 min23:400 min4 Mar
Chicago09:03 → 07:0323:3848 min23:380 min4 Mar
Jersey City10:03 → 08:0323:4448 min23:430 min4 Mar
Port of Spain11:03 → 09:0323:5448 min23:530 min4 Mar
London15:03 → 13:0323:4848 min23:470 min4 Mar
Durban17:03 → 15:0323:4448 min23:440 min4 Mar
Dubai19:03 → 17:0300:0648 min00:060 min4 Mar
Delhi20:33 → 18:3300:0948 min00:080 min4 Mar
Kolkata20:33 → 18:3323:2448 min23:240 min4 Mar
Singapore22:33 → 20:3300:2248 min00:220 min4 Mar
Sydney01:03 → 23:0323:430 min23:430 min4 Mar
Suva03:03 → 01:0323:540 min23:5448 min5 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

About Ahargaṇa