Ruling · Dattātreyotpatti (Datta Jayanti) · 2030

Monday 9 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 549 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 Sunday 8 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 Monday 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 04:00 on Mon 9 Dec to 06:40 on Tue 10 Dec.

    2030-12-08T20:00:03Z → 2030-12-09T22:40:28Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 8th, 16:56–18:52 on the 9th.

    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 8th and 116 of 116 on the 9th.

    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 32911 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2030: Monday 9 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2030 falls on Monday 9 December. Pūrṇimā runs from 04:00 on Mon 9 Dec to 06:40 on Tue 10 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2030/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 9 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 9 Dec
compat-drikpanchangComparison profileMon 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 8thCoveredSunset 9thCoveredRuled
Los Angeles12:00 → 14:4016:43113 min16:430 min8 Dec
Chicago14:00 → 16:4016:19118 min16:1921 min8 Dec
Jersey City15:00 → 17:4016:28117 min16:2872 min8 Dec
Port of Spain16:00 → 18:4017:43100 min17:4457 min8 Dec
London20:00 → 22:4015:510 min15:51129 min9 Dec
Durban22:00 → 00:4018:480 min18:4880 min9 Dec
Dubai00:00 → 02:4017:290 min17:29107 min9 Dec
Delhi01:30 → 04:1017:240 min17:24109 min9 Dec
Kolkata01:30 → 04:1016:520 min16:52106 min9 Dec
Singapore04:00 → 06:4018:580 min18:5896 min9 Dec
Sydney07:00 → 09:4019:570 min19:5777 min9 Dec
Suva08:00 → 10:4018:330 min18:3487 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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