Ruling · Vivasvat Saptamī · 1921

Monday 11 July

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 543 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 Monday 11 July

Taken. The only midday Saptamī reaches.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

48 of 48 minutes covered

Midday of Tuesday 12 July

Saptamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:21  12:09 madhyāhna ends
10:3310:5711:2111:4512:0912:3312:57

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 02:18 on Mon 11 Jul to 00:46 on Tue 12 Jul.

    1921-07-10T18:18:20Z → 1921-07-11T16:46:08Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:21–12:09 on the 11th, 11:21–12:09 on the 12th.

    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 11th and 0 of 48 on the 12th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102

  4. 04

    Tie-break

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

    priority: purvaviddha → only-day · margin 32556 s

  5. 05

    Ruling

    Vivasvat Saptamī, Daqing, 1921: Monday 11 July.

    confidence: determinate

Say it like this

In Daqing, Vivasvat Saptamī 1921 falls on Monday 11 July. Saptamī runs from 02:18 on Mon 11 Jul to 00:46 on Tue 12 Jul and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1921/vivasvat-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 11 Jul
Ahargaṇa, classicalDisc centre, no refractionMon 11 Jul
compat-drikpanchangComparison profileMon 11 Jul
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/vivasvat-saptami · ruleset 2026.3-draft

Month
Āṣāḍha, amānta
Pakṣa · aṅga
Śukla · Saptamī
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 102

“S 7 Vivasvat saptami (purvaviddha).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 102.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceSaptamīMadhyāhna 10thCoveredMadhyāhna 11thCoveredRuled
Los Angeles10:18 → 08:4611:3448 min11:340 min10 Jul
Chicago13:18 → 11:4612:321 min12:320 min10 Jul
Jersey City14:18 → 12:4612:370 min12:379 min11 Jul
Port of Spain14:18 → 12:4611:470 min11:4748 min11 Jul
London19:18 → 17:4612:410 min12:4148 min11 Jul
Durban20:18 → 18:4611:370 min11:3748 min11 Jul
Dubai22:18 → 20:4612:000 min12:0048 min11 Jul
Delhi23:48 → 22:1612:020 min12:0248 min11 Jul
Kolkata23:48 → 22:1611:180 min11:1848 min11 Jul
Singapore01:18 → 23:4611:460 min11:4648 min11 Jul
Sydney04:18 → 02:4611:360 min11:3648 min11 Jul
Suva06:18 → 04:4611:470 min11:4748 min11 Jul
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vivasvat-saptami@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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