Ruling · Yama Tarpaṇa · 1981

Wednesday 4 February

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 0 min 45 s away. Say “contested”.

Decide it for

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

The two dawns

One ghaṭī is 24 minutes. Aruṇodaya is 2 muhūrtas before sunrise.

Dawn of Tuesday 3 February

Caturdaśī is absent from aruṇodaya. Not taken.

05:34 aruṇodaya beginssunrise 07:23
05:1005:3405:5806:2206:4607:1007:34

0 of 110 minutes covered

Dawn of Wednesday 4 February

Taken. The only dawn Caturdaśī reaches.

05:33 aruṇodaya beginssunrise 07:22
Caturdaśī ends 07:23:08
05:0905:3305:5706:2106:4507:0907:33

110 of 110 minutes covered

Caturdaśī presentAruṇodaya, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Caturdaśī runs from 07:58 on Tue 3 Feb to 07:23 on Wed 4 Feb.

    1981-02-02T23:58:10Z → 1981-02-03T23:23:09Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:34–07:23 on the 3rd, 05:33–07:22 on the 4th.

    arunodaya: prev-night-muhurta-14-15 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Caturdaśī must be present during aruṇodaya. It covers 0 of 110 minutes on the 3rd and 110 of 110 on the 4th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 45 s < 300 s

  5. 05

    Ruling

    Yama Tarpaṇa, Baoding, 1981: Wednesday 4 February.

    confidence: boundary (margin)

Say it like this

In Baoding, Yama Tarpaṇa 1981 falls on Wednesday 4 February. Caturdaśī runs from 07:58 on Tue 3 Feb to 07:23 on Wed 4 Feb and covers all of aruṇodaya that dawn. It is 0 min 45 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/1981/yama-tarpana · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 4 Feb
Ahargaṇa, classicalDisc centre, no refractionWed 4 Feb
compat-drikpanchangComparison profileWed 4 Feb
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-tarpana · ruleset 2026.3-draft

Month
Pauṣa, amānta
Pakṣa · aṅga
Kṛṣṇa · Caturdaśī
Kāla
Aruṇodaya
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 105

“K 14 Yama tarpana (covering a period of 4 ghatikas before sunrise)” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 105.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceCaturdaśīAruṇodaya 2ndCoveredAruṇodaya 3rdCoveredRuled
Los Angeles15:58 → 15:2305:020 min05:02107 min3 Feb
Chicago17:58 → 17:2305:110 min05:10111 min3 Feb
Jersey City18:58 → 18:2305:150 min05:14111 min3 Feb
Port of Spain19:58 → 19:2304:510 min04:5199 min3 Feb
London23:58 → 23:2305:390 min05:38118 min3 Feb
Durban01:58 → 01:2304:010 min04:0284 min3 Feb
Dubai03:58 → 03:2305:180 min05:17104 min3 Feb
Delhi05:28 → 04:5305:240 min05:24100 min3 Feb
Kolkata05:28 → 04:5304:330 min04:3347 min3 Feb
Singapore07:28 → 06:5305:110 min05:110 min4 Feb
Sydney10:58 → 10:2304:550 min04:560 min4 Feb
Suva11:58 → 11:2304:250 min04:250 min4 Feb
Profile · tradition
pac-rp@2026.1 · smarta
Rule
yama-tarpana@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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