Ruling · Mahāśivarātri · 1909

Thursday 18 February

Boundaryin Baoding, under the Rashtriya Panchang method. Caturdaśī reaches niśītha on neither day and the rule does not say what then. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

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 Thursday 18 February

Taken. Caturdaśī reaches neither night; this is the day it falls on.

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

0 of 48 minutes covered

Night of Friday 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

Caturdaśī presentNiśītha, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Caturdaśī runs from 02:01 on Fri 19 Feb to 22:36 on Fri 19 Feb.

    1909-02-18T18:01:02Z → 1909-02-19T14:36:08Z

  2. 02

    Kāla

    Niśītha is 1 ghaṭikā either side of midnight: 00:08–00:56 on the 18th, 00:08–00:56 on the 19th.

    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 18th and 0 of 48 on the 19th.

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

  4. 04

    Tie-break

    Neither night qualifies. The day the tithi falls on is taken.

    priority: disputed → tithi-day · margin 3905 s

  5. 05

    Ruling

    Mahāśivarātri, Baoding, 1909: Thursday 18 February.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Mahāśivarātri 1909 falls on Thursday 18 February. Caturdaśī runs from 02:01 on Fri 19 Feb to 22:36 on Fri 19 Feb, and reaches niśītha on neither day.

ahargana.org/baoding/festivals/1909/maha-shivaratri · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 18 Feb
Ahargaṇa, classicalDisc centre, no refractionThu 18 Feb
compat-drikpanchangComparison profileThu 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 18thCoveredNiśītha 19thCoveredRuled
Los Angeles10:01 → 06:3623:4348 min23:430 min18 Feb
Chicago12:01 → 08:3623:4048 min23:400 min18 Feb
Jersey City13:01 → 09:3623:4648 min23:460 min18 Feb
Port of Spain14:01 → 10:3623:5648 min23:560 min18 Feb
London18:01 → 14:3623:5048 min23:500 min18 Feb
Durban20:01 → 16:3623:4648 min23:460 min18 Feb
Dubai21:42 → 18:1723:5048 min23:500 min18 Feb
Delhi23:31 → 20:0600:1148 min00:110 min18 Feb
Kolkata23:31 → 20:0623:2743 min23:260 min18 Feb
Singapore01:01 → 21:3623:550 min23:550 min18 Feb
Sydney04:01 → 00:3623:460 min23:4548 min19 Feb
Suva05:56 → 02:3123:520 min23:5148 min19 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