Ruling · Yama Tarpaṇa · 1909

Thursday 21 January

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 214 minutes.

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 Wednesday 20 January

Caturdaśī is absent from aruṇodaya. Not taken.

05:41 aruṇodaya beginssunrise 07:34
05:1705:4106:0506:2906:5307:1707:4108:05

0 of 113 minutes covered

Dawn of Thursday 21 January

Taken. The only dawn Caturdaśī reaches.

05:40 aruṇodaya beginssunrise 07:34
05:1605:4006:0406:2806:5207:1607:4008:04

113 of 113 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 13:35 on Wed 20 Jan to 11:08 on Thu 21 Jan.

    1909-01-20T05:35:12Z → 1909-01-21T03:07:49Z

  2. 02

    Kāla

    Aruṇodaya is 2 muhūrtas before sunrise: 05:41–07:34 on the 20th, 05:40–07:34 on the 21st.

    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 113 minutes on the 20th and 113 of 113 on the 21st.

    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 12856 s

  5. 05

    Ruling

    Yama Tarpaṇa, Baoding, 1909: Thursday 21 January.

    confidence: determinate

Say it like this

In Baoding, Yama Tarpaṇa 1909 falls on Thursday 21 January. Caturdaśī runs from 13:35 on Wed 20 Jan to 11:08 on Thu 21 Jan and covers all of aruṇodaya that dawn.

ahargana.org/baoding/festivals/1909/yama-tarpana · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 21 Jan
Ahargaṇa, classicalDisc centre, no refractionThu 21 Jan
compat-drikpanchangComparison profileThu 21 Jan
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 20thCoveredAruṇodaya 21stCoveredRuled
Los Angeles21:35 → 19:0805:07110 min05:070 min20 Jan
Chicago23:35 → 21:0805:19115 min05:180 min20 Jan
Jersey City00:35 → 22:0805:22115 min05:220 min20 Jan
Port of Spain01:35 → 23:0804:5099 min04:500 min20 Jan
London05:35 → 03:0805:52124 min05:510 min20 Jan
Durban07:35 → 05:0803:520 min03:5375 min21 Jan
Dubai09:16 → 06:4905:010 min05:01106 min21 Jan
Delhi11:05 → 08:3805:270 min05:27107 min21 Jan
Kolkata11:05 → 08:3804:350 min04:35104 min21 Jan
Singapore12:35 → 10:0804:380 min04:3996 min21 Jan
Sydney15:35 → 13:0803:450 min03:4680 min21 Jan
Suva17:30 → 15:0304:130 min04:1488 min21 Jan
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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