Midday of Wednesday 17 October
Taken. Both middays qualify; the rule takes the first.
madhyāhna begins 11:16 12:04 madhyāhna ends
10:2810:5211:1611:4012:0412:2812:52
48 of 48 minutes covered
Ruling · Mahānavamī · 2018
Boundaryin Cairo, under the Rashtriya Panchang method. A threshold is only 4 min 53 s away. Say “contested”.
One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.
Midday of Wednesday 17 October
Taken. Both middays qualify; the rule takes the first.
48 of 48 minutes covered
Midday of Thursday 18 October
Qualifies with 43 of 48 minutes. Not taken.
43 of 48 minutes covered, the first 43
Aṅga
Navamī runs from 09:20 on Wed 17 Oct to 11:59 on Thu 18 Oct.
2018-10-17T07:20:06Z → 2018-10-18T09:59:05Z
Kāla
Madhyāhna is 1 ghaṭikā either side of midday: 11:16–12:04 on the 17th, 11:16–12:04 on the 18th.
madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′
Rule
Navamī must be present during madhyāhna. It covers 48 of 48 minutes on the 17th and 43 of 48 on the 18th.
Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104
Tie-break
Both middays qualify. Pūrvaviddhā: the first is taken.
priority: purvaviddha → purvaviddha · margin 293 s < 300 s
Ruling
Mahānavamī, Cairo, 2018: Wednesday 17 October.
confidence: boundary (margin)
In Cairo, Mahānavamī 2018 falls on Wednesday 17 October. Navamī runs from 09:20 on Wed 17 Oct to 11:59 on Thu 18 Oct and covers all of madhyāhna that midday. It also reaches the next midday for 43 minutes; by the rule the first midday is taken. It is 4 min 53 s from a threshold: treat the date as contested.
| Authority | Kind | Date |
|---|---|---|
| Ahargaṇa, pac-rp | This ruling | Wed 17 Oct |
| Ahargaṇa, classical | Disc centre, no refraction | Wed 17 Oct |
| compat-drikpanchang | Comparison profile | Wed 17 Oct |
| No institution has a recorded ruling for Cairo. | ||
Institutional rulings are recorded with a source address, and are never edited to agree.
/rules/mahanavami · ruleset 2026.3-draft
“S 9 Mahanavami (purvaviddha) (In Bengal it is observed as paraviddha covering one muhurta from sunrise).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104. The Bengal reading (paraviddha, one muhūrta from sunrise) is not applied.
Twelve places, west to east. Local clock times.
| Place | Navamī | Madhyāhna 17th | Covered | Madhyāhna 18th | Covered | Ruled |
|---|---|---|---|---|---|---|
| Los Angeles | 00:20 → 02:59 | 12:14 | 48 min | 12:14 | 0 min | 17 Oct |
| Chicago | 02:20 → 04:59 | 12:12 | 48 min | 12:11 | 0 min | 17 Oct |
| Jersey City | 03:20 → 05:59 | 12:17 | 48 min | 12:17 | 0 min | 17 Oct |
| Port of Spain | 03:20 → 05:59 | 11:27 | 48 min | 11:27 | 0 min | 17 Oct |
| London | 08:20 → 10:59 | 12:21 | 48 min | 12:21 | 0 min | 17 Oct |
| Durban | 09:20 → 11:59 | 11:17 | 48 min | 11:17 | 42 min | 17 Oct |
| Dubai | 11:20 → 13:59 | 11:40 | 48 min | 11:40 | 48 min | 17 Oct |
| Delhi | 12:50 → 15:29 | 11:42 | 0 min | 11:42 | 48 min | 18 Oct |
| Kolkata | 12:50 → 15:29 | 10:58 | 0 min | 10:58 | 48 min | 18 Oct |
| Singapore | 15:20 → 17:59 | 12:26 | 0 min | 12:26 | 48 min | 18 Oct |
| Sydney | 18:20 → 20:59 | 12:17 | 0 min | 12:17 | 48 min | 18 Oct |
| Suva | 19:20 → 21:59 | 11:28 | 0 min | 11:28 | 48 min | 18 Oct |