Ruling · Dattātreyotpatti (Datta Jayanti) · 2008

Friday 12 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 345 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 Thursday 11 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

Evening of Friday 12 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 04:28 on Fri 12 Dec to 00:37 on Sat 13 Dec.

    2008-12-11T20:28:03Z → 2008-12-12T16:37:09Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 11th, 16:56–18:52 on the 12th.

    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 116 minutes on the 11th and 116 of 116 on the 12th.

    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 20685 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2008: Friday 12 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2008 falls on Friday 12 December. Pūrṇimā runs from 04:28 on Fri 12 Dec to 00:37 on Sat 13 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2008/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 12 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 12 Dec
compat-drikpanchangComparison profileFri 12 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 11thCoveredSunset 12thCoveredRuled
Los Angeles12:28 → 08:3716:44113 min16:440 min11 Dec
Chicago14:28 → 10:3716:19119 min16:200 min11 Dec
Jersey City15:28 → 11:3716:29118 min16:290 min11 Dec
Port of Spain16:28 → 12:3717:45100 min17:450 min11 Dec
London20:28 → 16:3715:510 min15:5146 min12 Dec
Durban22:28 → 18:3718:500 min18:510 min11 Dec
Dubai00:28 → 20:3717:300 min17:30107 min12 Dec
Delhi01:58 → 22:0717:250 min17:25109 min12 Dec
Kolkata01:58 → 22:0716:530 min16:53106 min12 Dec
Singapore04:28 → 00:3718:590 min19:0096 min12 Dec
Sydney07:28 → 03:3719:590 min20:0077 min12 Dec
Suva08:28 → 04:3718:350 min18:3686 min12 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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