Ruling · Mahāśivarātri (Shivratri) · 2031

Thursday 20 February

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 90 minutes.

Decide it for

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two nights

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

Night of Wednesday 19 February

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 Thursday 20 February

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 05:15 on Thu 20 Feb to 02:25 on Fri 21 Feb.

    2031-02-19T21:14:58Z → 2031-02-20T18:25:13Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 00:08–00:56 on the 19th, 00:08–00:56 on the 20th.

    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 19th and 48 of 48 on the 20th.

    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 5383 s

  5. 05

    Ruling

    Mahāśivarātri, Baoding, 2031: Thursday 20 February.

    confidence: determinate

Say it like this

In Baoding, Mahāśivarātri (Shivratri) 2031 falls on Thursday 20 February. Caturdaśī runs from 05:15 on Thu 20 Feb to 02:25 on Fri 21 Feb and covers all of niśītha that night.

ahargana.org/baoding/festivals/2031/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 20 Feb
Ahargaṇa, classicalDisc centre, no refractionThu 20 Feb
compat-drikpanchangComparison profileThu 20 Feb
No institution has a recorded ruling for Baoding.

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 19thCoveredNiśītha 20thCoveredRuled
Los Angeles13:15 → 10:2523:4248 min23:420 min19 Feb
Chicago15:15 → 12:2523:4048 min23:400 min19 Feb
Jersey City16:15 → 13:2523:4648 min23:460 min19 Feb
Port of Spain17:15 → 14:2523:5648 min23:560 min19 Feb
London21:15 → 18:2523:5048 min23:500 min19 Feb
Durban23:15 → 20:2523:4648 min23:460 min19 Feb
Dubai01:15 → 22:2500:080 min00:080 min19 Feb
Delhi02:45 → 23:5500:110 min00:110 min19 Feb
Kolkata02:45 → 23:5523:260 min23:2629 min20 Feb
Singapore05:15 → 02:2500:540 min00:5448 min20 Feb
Sydney08:15 → 05:2500:450 min00:4548 min20 Feb
Suva09:15 → 06:2523:560 min23:5648 min20 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

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