Ruling · Mahāśivarātri · 2001

Wednesday 21 February

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 572 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 21 February

Taken. The only night Caturdaśī reaches.

niśītha begins 23:29  00:17 niśītha ends
22:4123:0523:2923:5300:1700:4101:05

48 of 48 minutes covered

Night of Thursday 22 February

Caturdaśī is absent from niśītha. Not taken.

niśītha begins 23:29  00:17 niśītha ends
22:4123:0523:2923:5300:1700:4101:05

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 11:20 on Wed 21 Feb to 13:57 on Thu 22 Feb.

    2001-02-21T03:19:39Z → 2001-02-22T05:57:15Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 23:29–00:17 on the 21st, 23:29–00:17 on the 22nd.

    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 21st and 0 of 48 on the 22nd.

    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 34305 s

  5. 05

    Ruling

    Mahāśivarātri, Daqing, 2001: Wednesday 21 February.

    confidence: determinate

Say it like this

In Daqing, Mahāśivarātri 2001 falls on Wednesday 21 February. Caturdaśī runs from 11:20 on Wed 21 Feb to 13:57 on Thu 22 Feb and covers all of niśītha that night.

ahargana.org/daqing/festivals/2001/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 21 Feb
Ahargaṇa, classicalDisc centre, no refractionWed 21 Feb
compat-drikpanchangComparison profileWed 21 Feb
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 21stCoveredNiśītha 22ndCoveredRuled
Los Angeles19:20 → 21:5723:420 min23:420 min20 Feb
Chicago21:20 → 23:5723:4018 min23:400 min20 Feb
Jersey City22:20 → 00:5723:4548 min23:450 min20 Feb
Port of Spain23:20 → 01:5723:5648 min23:550 min20 Feb
London03:20 → 05:5723:4948 min23:490 min21 Feb
Durban05:20 → 07:5723:4648 min23:460 min21 Feb
Dubai07:20 → 09:5700:0848 min00:080 min21 Feb
Delhi08:50 → 11:2700:1048 min00:100 min21 Feb
Kolkata08:50 → 11:2723:2648 min23:260 min21 Feb
Singapore11:20 → 13:5700:5448 min00:540 min21 Feb
Sydney14:20 → 16:5700:4548 min00:450 min21 Feb
Suva15:20 → 17:5723:5648 min23:560 min21 Feb
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