Ruling · Yama Dīpadāna · 1987

Tuesday 20 October

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 283 minutes.

Decide it for

BaodingDelhiKolkataSingaporeSydneyJersey City

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

The two evenings

One ghaṭī is 24 minutes. Pradoṣa is 2 muhūrtas after sunset.

Evening of Monday 19 October

Trayodaśī is absent from pradoṣa. Not taken.

17:35 sunsetpradoṣa ends 19:19
17:1117:3517:5918:2318:4719:1119:35

0 of 104 minutes covered

Evening of Tuesday 20 October

Taken. The only evening Trayodaśī reaches.

17:34 sunsetpradoṣa ends 19:18
17:1017:3417:5818:2218:4619:1019:34

104 of 104 minutes covered

Trayodaśī presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Trayodaśī runs from 00:02 on Tue 20 Oct to 01:07 on Wed 21 Oct.

    1987-10-19T16:01:39Z → 1987-10-20T17:06:45Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:35–19:19 on the 19th, 17:34–19:18 on the 20th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Trayodaśī must be present during pradoṣa. It covers 0 of 104 minutes on the 19th and 104 of 104 on the 20th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

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

    priority: unstated → only-day · margin 16976 s

  5. 05

    Ruling

    Yama Dīpadāna, Baoding, 1987: Tuesday 20 October.

    confidence: determinate

Say it like this

In Baoding, Yama Dīpadāna 1987 falls on Tuesday 20 October. Trayodaśī runs from 00:02 on Tue 20 Oct to 01:07 on Wed 21 Oct and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1987/yama-dipadana · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 20 Oct
Ahargaṇa, classicalDisc centre, no refractionTue 20 Oct
compat-drikpanchangComparison profileTue 20 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-dipadana · ruleset 2026.3-draft

Month
Āśvina, amānta
Pakṣa · aṅga
Kṛṣṇa · Trayodaśī
Kāla
Pradoṣa
Priority
Unstated
Tie-break
Longer coverage, as a boundary
Reference
CRC 1955, p. 104

“K 13 Yama dipadana (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlaceTrayodaśīSunset 19thCoveredSunset 20thCoveredRuled
Los Angeles09:02 → 10:0718:14102 min18:130 min19 Oct
Chicago11:02 → 12:0718:03105 min18:020 min19 Oct
Jersey City12:02 → 13:0718:10104 min18:090 min19 Oct
Port of Spain12:02 → 13:0717:4797 min17:460 min19 Oct
London17:02 → 18:0718:00108 min17:589 min19 Oct
Durban18:02 → 19:0718:0889 min18:0858 min19 Oct
Dubai20:02 → 21:0717:490 min17:48100 min20 Oct
Delhi21:32 → 22:3717:480 min17:47101 min20 Oct
Kolkata21:32 → 22:3717:080 min17:08100 min20 Oct
Singapore00:02 → 01:0718:520 min18:5295 min20 Oct
Sydney02:02 → 03:0718:110 min18:1288 min20 Oct
Suva04:02 → 05:0718:080 min18:0891 min20 Oct
Profile · tradition
pac-rp@2026.1 · smarta
Rule
yama-dipadana@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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