Ruling · Vivasvat Saptamī · 1929

Friday 12 July

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 3 min 22 s away. Say “contested”.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

38°52′ N 115°28′ E · Asia/Shanghai · GeoNames 1816971

The two middays

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

Midday of Friday 12 July

Taken. The only midday Saptamī reaches.

madhyāhna begins 11:59  12:47 madhyāhna ends
Saptamī begins 12:16:08
11:1111:3511:5912:2312:4713:1113:35

31 of 48 minutes covered, the last 31

Midday of Saturday 13 July

Saptamī is absent from madhyāhna. Not taken.

madhyāhna begins 11:59  12:47 madhyāhna ends
Saptamī ends 11:56:05
11:1111:3511:5912:2312:4713:1113:35

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 12:16 on Fri 12 Jul to 11:56 on Sat 13 Jul.

    1929-07-12T04:16:09Z → 1929-07-13T03:56:06Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:59–12:47 on the 12th, 11:59–12:47 on the 13th.

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

  3. 03

    Rule

    Saptamī must be present during madhyāhna. It covers 31 of 48 minutes on the 12th and 0 of 48 on the 13th.

    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 202 s < 300 s

  5. 05

    Ruling

    Vivasvat Saptamī, Baoding, 1929: Friday 12 July.

    confidence: boundary (margin)

Say it like this

In Baoding, Vivasvat Saptamī 1929 falls on Friday 12 July. Saptamī runs from 12:16 on Fri 12 Jul to 11:56 on Sat 13 Jul and covers 31 of 48 minutes of madhyāhna that midday. It is 3 min 22 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1929/vivasvat-saptami · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 12 Jul
Ahargaṇa, classicalDisc centre, no refractionFri 12 Jul
compat-drikpanchangComparison profileFri 12 Jul
No institution has a recorded ruling for Baoding.

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 12thCoveredMadhyāhna 13thCoveredRuled
Los Angeles20:16 → 19:5611:3448 min11:340 min12 Jul
Chicago23:16 → 22:5612:3248 min12:320 min12 Jul
Jersey City00:16 → 23:5612:3848 min12:380 min12 Jul
Port of Spain00:16 → 23:5611:4748 min11:480 min12 Jul
London05:16 → 04:5612:4248 min12:420 min12 Jul
Durban06:16 → 05:5611:3748 min11:370 min12 Jul
Dubai08:16 → 07:5612:0048 min12:000 min12 Jul
Delhi09:46 → 09:2612:0248 min12:020 min12 Jul
Kolkata09:46 → 09:2611:1848 min11:180 min12 Jul
Singapore11:16 → 10:5611:4648 min11:460 min12 Jul
Sydney14:16 → 13:5611:370 min11:3748 min13 Jul
Suva16:16 → 15:5611:480 min11:4848 min13 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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