Ruling · Vāmana Jayantī · 1921

Tuesday 13 September

Determinatein Daqing, under the Rashtriya Panchang method. Clear of every threshold by 152 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 Tuesday 13 September

Taken. The only midday Dvādaśī reaches.

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

48 of 48 minutes covered

Midday of Wednesday 14 September

Dvādaśī is absent from madhyāhna. Not taken.

madhyāhna begins 11:11  11:59 madhyāhna ends
10:2310:4711:1111:3511:5912:2312:47

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 06:12 on Tue 13 Sep to 08:40 on Wed 14 Sep.

    1921-09-12T22:12:22Z → 1921-09-14T00:39:38Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:12–12:00 on the 13th, 11:11–11:59 on the 14th.

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

  3. 03

    Rule

    Dvādaśī must be present during madhyāhna. It covers 48 of 48 minutes on the 13th and 0 of 48 on the 14th.

    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 9104 s

  5. 05

    Ruling

    Vāmana Jayantī, Daqing, 1921: Tuesday 13 September.

    confidence: determinate

Say it like this

In Daqing, Vāmana Jayantī 1921 falls on Tuesday 13 September. Dvādaśī runs from 06:12 on Tue 13 Sep to 08:40 on Wed 14 Sep and covers all of madhyāhna that midday.

ahargana.org/daqing/festivals/1921/vamana-jayanti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 13 Sep
Ahargaṇa, classicalDisc centre, no refractionTue 13 Sep
compat-drikpanchangComparison profileTue 13 Sep
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/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 12thCoveredMadhyāhna 14thCoveredRuled
Los Angeles14:12 → 16:4011:250 min11:240 min13 Sep
Chicago17:12 → 19:4012:230 min12:220 min13 Sep
Jersey City18:12 → 20:4012:280 min12:280 min13 Sep
Port of Spain18:12 → 20:4011:380 min11:380 min13 Sep
London23:12 → 01:4012:320 min12:320 min13 Sep
Durban00:12 → 02:4011:290 min11:280 min13 Sep
Dubai02:12 → 04:4011:510 min11:500 min13 Sep
Delhi03:42 → 06:1011:530 min11:530 min13 Sep
Kolkata03:42 → 06:1011:090 min11:080 min13 Sep
Singapore05:12 → 07:4011:370 min11:360 min13 Sep
Sydney08:12 → 10:4011:280 min11:270 min13 Sep
Suva10:12 → 12:4011:390 min11:3848 min13 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

About Ahargaṇa