Ruling · Vāmana Jayantī · 1950

Friday 22 September

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 03 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 22 September

Taken. The only midday Dvādaśī reaches.

madhyāhna begins 11:47  12:35 madhyāhna ends
Dvādaśī begins 11:50:52
10:5911:2311:4712:1112:3512:5913:23

44 of 48 minutes covered, the last 44

Midday of Saturday 23 September

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:46  12:34 madhyāhna ends
Dvādaśī ends 11:17:52
10:5811:2211:4612:1012:3412:5813:22

0 of 48 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Dvādaśī runs from 11:51 on Fri 22 Sep to 11:18 on Sat 23 Sep.

    1950-09-22T03:50:52Z → 1950-09-23T03:17:53Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:47–12:35 on the 22nd, 11:46–12:34 on the 23rd.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 44 of 48 minutes on the 22nd and 0 of 48 on the 23rd.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 243 s < 300 s

  5. 05

    Ruling

    Vāmana Jayantī, Baoding, 1950: Friday 22 September.

    confidence: boundary (margin)

Say it like this

In Baoding, Vāmana Jayantī 1950 falls on Friday 22 September. Dvādaśī runs from 11:51 on Fri 22 Sep to 11:18 on Sat 23 Sep and covers 44 of 48 minutes of madhyāhna that midday. It is 4 min 03 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1950/vamana-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 22 Sep
Ahargaṇa, classicalDisc centre, no refractionFri 22 Sep
compat-drikpanchangComparison profileFri 22 Sep
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/vamana-jayanti · ruleset 2026.3-draft

Month
Bhādrapada, amānta
Pakṣa · aṅga
Śukla · Dvādaśī
Kāla
Madhyāhna
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 103

“S 12 Visnuparivartanotsava, Sakrotthana (in any of the naksatras U. Asadha, Sravana & Dhanistha), Kalki dvadasi, Sravana dvadasi (when combined with naksatra Sravana), Vamana jayanti (madhyahna vyapini).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 103.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvādaśīMadhyāhna 22ndCoveredMadhyāhna 23rdCoveredRuled
Los Angeles20:51 → 20:1812:2148 min12:210 min22 Sep
Chicago22:51 → 22:1812:1948 min12:190 min22 Sep
Jersey City23:51 → 23:1812:2548 min12:240 min22 Sep
Port of Spain23:51 → 23:1811:3548 min11:340 min22 Sep
London04:51 → 04:1812:2948 min12:290 min22 Sep
Durban05:51 → 05:1811:2548 min11:250 min22 Sep
Dubai07:51 → 07:1811:4848 min11:470 min22 Sep
Delhi09:21 → 08:4811:5048 min11:490 min22 Sep
Kolkata09:21 → 08:4811:0548 min11:050 min22 Sep
Singapore11:21 → 10:4812:0448 min12:030 min22 Sep
Sydney13:51 → 13:1811:240 min11:2448 min23 Sep
Suva15:51 → 15:1811:350 min11:3548 min23 Sep
Profile · tradition
pac-rp@2026.1 · smarta
Rule
vamana-jayanti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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