Ruling · Mahāśivarātri (Shivratri) · 1985

Monday 18 February

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 33 s away. Say “contested”.

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 Sunday 17 February

Caturdaśī is absent from niśītha. Not taken.

niśītha begins 00:08  00:56 niśītha ends
Caturdaśī begins 00:56:24
23:2023:4400:0800:3200:5601:2001:44

0 of 48 minutes covered

Night of Monday 18 February

Taken. The only night Caturdaśī reaches.

niśītha begins 00:08  00:56 niśītha ends
Caturdaśī ends 01:37:12
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 00:56 on Mon 18 Feb to 01:37 on Tue 19 Feb.

    1985-02-17T16:56:24Z → 1985-02-18T17:37:13Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 00:08–00:56 on the 17th, 00:08–00:56 on the 18th.

    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 17th and 48 of 48 on the 18th.

    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 33 s < 300 s

  5. 05

    Ruling

    Mahāśivarātri, Baoding, 1985: Monday 18 February.

    confidence: boundary (margin)

Say it like this

In Baoding, Mahāśivarātri (Shivratri) 1985 falls on Monday 18 February. Caturdaśī runs from 00:56 on Mon 18 Feb to 01:37 on Tue 19 Feb and covers all of niśītha that night. It is 0 min 33 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1985/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 18 Feb
Ahargaṇa, classicalDisc centre, no refractionMon 18 Feb
compat-drikpanchangComparison profileMon 18 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 17thCoveredNiśītha 18thCoveredRuled
Los Angeles08:56 → 09:3723:4348 min23:430 min17 Feb
Chicago10:56 → 11:3723:4048 min23:400 min17 Feb
Jersey City11:56 → 12:3723:4648 min23:460 min17 Feb
Port of Spain12:56 → 13:3723:5648 min23:560 min17 Feb
London16:56 → 17:3723:5048 min23:500 min17 Feb
Durban18:56 → 19:3723:4648 min23:460 min17 Feb
Dubai20:56 → 21:3700:0948 min00:090 min17 Feb
Delhi22:26 → 23:0700:1148 min00:110 min17 Feb
Kolkata22:26 → 23:0723:2648 min23:260 min17 Feb
Singapore00:56 → 01:3700:5546 min00:5543 min17 Feb
Sydney03:56 → 04:3700:450 min00:4548 min18 Feb
Suva04:56 → 05:3723:560 min23:5648 min18 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