Ruling · Mitra Saptamī · 1920

Friday 17 December

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 66 minutes.

Decide it for

DaqingDelhiKolkataSingaporeSydneyJersey City

46°35′ N 125°00′ E · Asia/Shanghai · GeoNames 2037860

The two middays

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

Midday of Friday 17 December

Taken. The only midday Saptamī reaches.

madhyāhna begins 11:12  12:00 madhyāhna ends
10:2410:4811:1211:3612:0012:2412:48

48 of 48 minutes covered

Midday of Saturday 18 December

Saptamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:12  12:00 madhyāhna ends
10:2410:4811:1211:3612:0012:2412:48

0 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 08:31 on Fri 17 Dec to 10:07 on Sat 18 Dec.

    1920-12-17T00:31:24Z → 1920-12-18T02:06:39Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:12–12:00 on the 17th, 11:12–12:00 on the 18th.

    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 17th and 0 of 48 on the 18th.

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

  4. 04

    Tie-break

    Only one midday qualifies. No tie-break is needed.

    priority: purvaviddha → only-day · margin 3950 s

  5. 05

    Ruling

    Mitra Saptamī, Daqing, 1920: Friday 17 December.

    confidence: determinate

Say it like this

In Daqing, Mitra Saptamī 1920 falls on Friday 17 December. Saptamī runs from 08:31 on Fri 17 Dec to 10:07 on Sat 18 Dec and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1920/mitra-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 17 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 17 Dec
compat-drikpanchangComparison profileFri 17 Dec
No institution has a recorded ruling for Daqing.

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 17thCoveredMadhyāhna 18thCoveredRuled
Los Angeles16:31 → 18:0711:2548 min11:260 min17 Dec
Chicago18:31 → 20:0711:2348 min11:230 min17 Dec
Jersey City19:31 → 21:0711:2948 min11:290 min17 Dec
Port of Spain20:31 → 22:0711:3848 min11:390 min17 Dec
London00:31 → 02:0711:3348 min11:330 min17 Dec
Durban02:31 → 04:0711:2848 min11:290 min17 Dec
Dubai04:31 → 06:0711:5148 min11:510 min17 Dec
Delhi06:01 → 07:3711:5348 min11:540 min17 Dec
Kolkata06:01 → 07:3711:0948 min11:090 min17 Dec
Singapore07:31 → 09:0711:3748 min11:370 min17 Dec
Sydney10:31 → 12:0711:2748 min11:2839 min17 Dec
Suva12:31 → 14:0711:380 min11:3948 min18 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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