Ruling · Mitra Saptamī · 2001

Friday 21 December

Determinatein Chattogram, under the Rashtriya Panchang method. Clear of every threshold by 17 minutes.

Decide it for

ChattogramDelhiKolkataSingaporeSydneyJersey City

22°20′ N 91°50′ E · Asia/Dhaka · GeoNames 1205733

The two middays

One ghaṭī is 24 minutes. Madhyāhna is 1 ghaṭikā either side of midday.

Midday of Friday 21 December

Taken. Both middays qualify; the rule takes the first.

madhyāhna begins 11:27  12:15 madhyāhna ends
Saptamī begins 11:09:28
10:3911:0311:2711:5112:1512:3913:03

48 of 48 minutes covered

Midday of Saturday 22 December

Qualifies with 48 of 48 minutes. Not taken.

madhyāhna begins 11:27  12:15 madhyāhna ends
10:3911:0311:2711:5112:1512:3913:03

48 of 48 minutes covered

Saptamī presentMadhyāhna, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Saptamī runs from 11:09 on Fri 21 Dec to 13:42 on Sat 22 Dec.

    2001-12-21T05:09:28Z → 2001-12-22T07:42:28Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:27–12:15 on the 21st, 11:27–12:15 on the 22nd.

    madhyahna: midday-pm-1-ghatika · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Saptamī must be present during madhyāhna. It covers 48 of 48 minutes on the 21st and 48 of 48 on the 22nd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Both middays qualify. Pūrvaviddhā: the first is taken.

    priority: purvaviddha → purvaviddha · margin 1034 s

  5. 05

    Ruling

    Mitra Saptamī, Chattogram, 2001: Friday 21 December.

    confidence: determinate

Say it like this

In Chattogram, Mitra Saptamī 2001 falls on Friday 21 December. Saptamī runs from 11:09 on Fri 21 Dec to 13:42 on Sat 22 Dec and covers all of madhyāhna that midday. It also reaches the next midday for 48 minutes; by the rule the first midday is taken.

ahargana.org/chattogram/festivals/2001/mitra-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 21 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 21 Dec
compat-drikpanchangComparison profileFri 21 Dec
No institution has a recorded ruling for Chattogram.

Institutional rulings are recorded with a source address, and are never edited to agree.

The rule, as data

/rules/mitra-saptami · ruleset 2026.3-draft

Month
Mārgaśīrṣa, amānta
Pakṣa · aṅga
Śukla · Saptamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 7 Mitra saptami (purvaviddha).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSaptamīMadhyāhna 21stCoveredMadhyāhna 22ndCoveredRuled
Los Angeles21:09 → 23:4211:2748 min11:280 min21 Dec
Chicago23:09 → 01:4211:2548 min11:250 min21 Dec
Jersey City00:09 → 02:4211:3148 min11:310 min21 Dec
Port of Spain01:09 → 03:4211:4048 min11:410 min21 Dec
London05:09 → 07:4211:3548 min11:350 min21 Dec
Durban07:09 → 09:4211:3048 min11:300 min21 Dec
Dubai09:09 → 11:4211:5348 min11:530 min21 Dec
Delhi10:39 → 13:1211:5548 min11:5648 min21 Dec
Kolkata10:39 → 13:1211:1148 min11:1148 min21 Dec
Singapore13:09 → 15:4212:3917 min12:3948 min21 Dec
Sydney16:09 → 18:4212:290 min12:3048 min22 Dec
Suva17:09 → 19:4211:400 min11:4148 min22 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
mitra-saptami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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