Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2017

Sunday 3 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 296 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 Saturday 2 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:51
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 115 minutes covered

Evening of Sunday 3 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:51
16:3216:5617:2017:4418:0818:3218:5619:20

115 of 115 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 03:28 on Sun 3 Dec to 23:47 on Sun 3 Dec.

    2017-12-02T19:27:40Z → 2017-12-03T15:46:58Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 2nd, 16:56–18:51 on the 3rd.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 0 of 115 minutes on the 2nd and 115 of 115 on the 3rd.

    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 17744 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2017: Sunday 3 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2017 falls on Sunday 3 December. Pūrṇimā runs from 03:28 on Sun 3 Dec to 23:47 on Sun 3 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2017/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 3 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 3 Dec
compat-drikpanchangComparison profileSun 3 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 2ndCoveredSunset 3rdCoveredRuled
Los Angeles11:28 → 07:4716:43112 min16:430 min2 Dec
Chicago13:28 → 09:4716:20118 min16:200 min2 Dec
Jersey City14:28 → 10:4716:29117 min16:290 min2 Dec
Port of Spain15:28 → 11:4717:42100 min17:420 min2 Dec
London19:28 → 15:4715:540 min15:530 min2 Dec
Durban21:28 → 17:4718:430 min18:440 min2 Dec
Dubai23:28 → 19:4717:280 min17:28107 min3 Dec
Delhi00:58 → 21:1717:230 min17:23109 min3 Dec
Kolkata00:58 → 21:1716:510 min16:51105 min3 Dec
Singapore03:28 → 23:4718:550 min18:5696 min3 Dec
Sydney06:28 → 02:4719:520 min19:5378 min3 Dec
Suva08:28 → 04:4719:300 min19:3087 min3 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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