Ruling · Yama Dvitīyā (Bhai Dooj) · 2009

Tuesday 20 October

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 45 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 Monday 19 October

Dvitīyā is absent from madhyāhna. Not taken.

madhyāhna begins 11:39  12:27 madhyāhna ends
Dvitīyā begins 12:27:37
10:5111:1511:3912:0312:2712:5113:15

0 of 48 minutes covered

Midday of Tuesday 20 October

Taken. The only midday Dvitīyā reaches.

madhyāhna begins 11:39  12:27 madhyāhna ends
Dvitīyā ends 11:57:40
10:5111:1511:3912:0312:2712:5113:15

19 of 48 minutes covered, the first 19

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

How it was decided

  1. 01

    Aṅga

    Dvitīyā runs from 12:28 on Mon 19 Oct to 11:58 on Tue 20 Oct.

    2009-10-19T04:27:38Z → 2009-10-20T03:57:40Z

  2. 02

    Kāla

    Madhyāhna is 1 ghaṭikā either side of midday: 11:39–12:27 on the 19th, 11:39–12:27 on the 20th.

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

  3. 03

    Rule

    Dvitīyā must be present during madhyāhna. It covers 0 of 48 minutes on the 19th and 19 of 48 on the 20th.

    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 45 s < 300 s

  5. 05

    Ruling

    Yama Dvitīyā, Baoding, 2009: Tuesday 20 October.

    confidence: boundary (margin)

Say it like this

In Baoding, Yama Dvitīyā (Bhai Dooj) 2009 falls on Tuesday 20 October. Dvitīyā runs from 12:28 on Mon 19 Oct to 11:58 on Tue 20 Oct and covers 19 of 48 minutes of madhyāhna that midday. It is 0 min 45 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2009/yama-dvitiya · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 20 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 20 Oct
compat-drikpanchangComparison profileMon 19 Oct
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/yama-dvitiya · ruleset 2026.3-draft

Month
Kārtika, amānta
Pakṣa · aṅga
Śukla · Dvitīyā
Kāla
Madhyāhna
Priority
Pūrvaviddhā
Tie-break
First day
Reference
CRC 1955, p. 104

“S 2 Bhratrdvitiya, Yamadvitiya (madhyahna, purvaviddha), Masyadhara (Dwat) puja (Bihar).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceDvitīyāMadhyāhna 19thCoveredMadhyāhna 20thCoveredRuled
Los Angeles21:28 → 20:5812:1448 min12:130 min19 Oct
Chicago23:28 → 22:5812:1148 min12:110 min19 Oct
Jersey City00:28 → 23:5812:1748 min12:170 min19 Oct
Port of Spain00:28 → 23:5811:2748 min11:270 min19 Oct
London05:28 → 04:5812:2148 min12:210 min19 Oct
Durban06:28 → 05:5811:1748 min11:170 min19 Oct
Dubai08:28 → 07:5811:4048 min11:390 min19 Oct
Delhi09:58 → 09:2811:4248 min11:420 min19 Oct
Kolkata09:58 → 09:2810:5748 min10:570 min19 Oct
Singapore12:28 → 11:5812:2646 min12:250 min19 Oct
Sydney15:28 → 14:5812:160 min12:1648 min20 Oct
Suva16:28 → 15:5811:270 min11:2748 min20 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
yama-dvitiya@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

About Ahargaṇa