Ruling · Dattātreyotpatti (Datta Jayanti) · 2087

Tuesday 9 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 399 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 Tuesday 9 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:52
16:3216:5617:2017:4418:0818:3218:5619:20

116 of 116 minutes covered

Evening of Wednesday 10 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:52
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 116 minutes covered

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 10:17 on Tue 9 Dec to 06:33 on Wed 10 Dec.

    2087-12-09T02:17:04Z → 2087-12-09T22:33:09Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 9th, 16:56–18:52 on the 10th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 116 of 116 minutes on the 9th and 0 of 116 on the 10th.

    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 23930 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2087: Tuesday 9 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2087 falls on Tuesday 9 December. Pūrṇimā runs from 10:17 on Tue 9 Dec to 06:33 on Wed 10 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2087/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 9 Dec
Ahargaṇa, classicalDisc centre, no refractionTue 9 Dec
compat-drikpanchangComparison profileTue 9 Dec
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/dattatreyotpatti · ruleset 2026.3-draft

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

“S 15 Dattatreyotpatti (pradosa).” Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104.

The same rule, elsewhere

Twelve places, west to east. Local clock times.

PlacePūrṇimāSunset 9thCoveredSunset 10thCoveredRuled
Los Angeles18:17 → 14:3316:440 min16:440 min8 Dec
Chicago20:17 → 16:3316:1914 min16:190 min9 Dec
Jersey City21:17 → 17:3316:2965 min16:290 min9 Dec
Port of Spain22:17 → 18:3317:4449 min17:440 min9 Dec
London02:17 → 22:3315:51129 min15:510 min9 Dec
Durban04:17 → 00:3318:4980 min18:490 min9 Dec
Dubai06:17 → 02:3317:30107 min17:300 min9 Dec
Delhi07:47 → 04:0317:24109 min17:250 min9 Dec
Kolkata07:47 → 04:0316:53106 min16:530 min9 Dec
Singapore10:17 → 06:3318:5896 min18:590 min9 Dec
Sydney13:17 → 09:3319:5877 min19:580 min9 Dec
Suva14:17 → 10:3318:3487 min18:350 min9 Dec
Profile · tradition
pac-rp@2026.1 · smarta
Rule
dattatreyotpatti@2026.3-draft
Engine · kernel
0.1.0 · de440 7eef…ea74
Boundary margin
300 s

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