Night of Tuesday 17 February
Qualifies with 22 of 48 minutes. Not taken.
niśītha begins 23:49 00:37 niśītha ends
Caturdaśī begins 00:15:54
23:0123:2523:4900:1300:3701:0101:25
22 of 48 minutes covered, the last 22
Ruling · Mahāśivarātri · 1920
Boundaryin Tehran, under the Rashtriya Panchang method. Both nights qualify and the authorities the rule cites disagree. Say “contested”.
One ghaṭī is 24 minutes. Niśītha is 1 ghaṭikā either side of midnight.
Night of Tuesday 17 February
Qualifies with 22 of 48 minutes. Not taken.
22 of 48 minutes covered, the last 22
Night of Wednesday 18 February
Taken. Both nights qualify; the rule is silent, and this one is covered longer.
48 of 48 minutes covered
Aṅga
Caturdaśī runs from 00:15 on Wed 18 Feb to 00:54 on Thu 19 Feb.
1920-02-17T20:50:10Z → 1920-02-18T21:28:58Z
Kāla
Niśītha is 1 ghaṭikā either side of midnight: 23:49–00:37 on the 17th, 23:49–00:37 on the 18th.
nishita: midnight-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′
Rule
Caturdaśī must be present during niśītha. It covers 22 of 48 minutes on the 17th and 48 of 48 on the 18th.
Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105
Tie-break
Both nights qualify and the cited authorities disagree. The one covered longer is ruled, as a boundary.
priority: disputed → greater-coverage · margin 1008 s
Ruling
Mahāśivarātri, Tehran, 1920: Wednesday 18 February.
confidence: boundary (tie-break-disputed)
In Tehran, Mahāśivarātri 1920 falls on Wednesday 18 February. Caturdaśī runs from 00:15 on Wed 18 Feb to 00:54 on Thu 19 Feb and covers all of niśītha that night. It also reaches the previous night for 22 minutes; the rule does not say which to take, and the one covered longer is ruled: treat the date as contested.
| Authority | Kind | Date |
|---|---|---|
| Ahargaṇa, pac-rp | This ruling | Wed 18 Feb |
| Ahargaṇa, classical | Disc centre, no refraction | Wed 18 Feb |
| compat-drikpanchang | Comparison profile | Wed 18 Feb |
| No institution has a recorded ruling for Tehran. | ||
Institutional rulings are recorded with a source address, and are never edited to agree.
/rules/maha-shivaratri · ruleset 2026.3-draft
“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.
Twelve places, west to east. Local clock times.
| Place | Caturdaśī | Niśītha 17th | Covered | Niśītha 18th | Covered | Ruled |
|---|---|---|---|---|---|---|
| Los Angeles | 12:50 → 13:29 | 23:43 | 48 min | 23:43 | 0 min | 17 Feb |
| Chicago | 14:50 → 15:29 | 23:40 | 48 min | 23:40 | 0 min | 17 Feb |
| Jersey City | 15:50 → 16:29 | 23:46 | 48 min | 23:46 | 0 min | 17 Feb |
| Port of Spain | 16:50 → 17:29 | 23:56 | 48 min | 23:56 | 0 min | 17 Feb |
| London | 20:50 → 21:29 | 23:50 | 48 min | 23:50 | 0 min | 17 Feb |
| Durban | 22:50 → 23:29 | 23:46 | 48 min | 23:46 | 0 min | 17 Feb |
| Dubai | 00:50 → 01:29 | 00:09 | 7 min | 00:09 | 48 min | 18 Feb |
| Delhi | 02:20 → 02:59 | 00:11 | 0 min | 00:11 | 48 min | 18 Feb |
| Kolkata | 02:20 → 02:59 | 23:27 | 0 min | 23:27 | 48 min | 18 Feb |
| Singapore | 03:50 → 04:29 | 23:55 | 0 min | 23:55 | 48 min | 18 Feb |
| Sydney | 06:50 → 07:29 | 23:46 | 0 min | 23:46 | 48 min | 18 Feb |
| Suva | 08:50 → 09:29 | 23:57 | 0 min | 23:57 | 48 min | 18 Feb |