Ruling · Dattātreyotpatti (Datta Jayanti) · 2089

Saturday 17 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 285 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 Friday 16 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:54
16:3316:5717:2117:4518:0918:3318:5719:21

0 of 117 minutes covered

Evening of Saturday 17 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:54
16:3416:5817:2217:4618:1018:3418:5819:22

117 of 117 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 02:06 on Sat 17 Dec to 23:39 on Sat 17 Dec.

    2089-12-16T18:05:57Z → 2089-12-17T15:39:09Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:54 on the 16th, 16:58–18:54 on the 17th.

    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 117 minutes on the 16th and 117 of 117 on the 17th.

    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 17088 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2089: Saturday 17 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2089 falls on Saturday 17 December. Pūrṇimā runs from 02:06 on Sat 17 Dec to 23:39 on Sat 17 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2089/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 17 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 17 Dec
compat-drikpanchangComparison profileSat 17 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 16thCoveredSunset 17thCoveredRuled
Los Angeles10:06 → 07:3916:46113 min16:460 min16 Dec
Chicago12:06 → 09:3916:21119 min16:210 min16 Dec
Jersey City13:06 → 10:3916:30118 min16:310 min16 Dec
Port of Spain14:06 → 11:3917:47100 min17:480 min16 Dec
London18:06 → 15:3915:520 min15:520 min16 Dec
Durban20:06 → 17:3918:547 min18:540 min16 Dec
Dubai22:06 → 19:3917:320 min17:33107 min17 Dec
Delhi23:36 → 21:0917:270 min17:27110 min17 Dec
Kolkata23:36 → 21:0916:550 min16:56106 min17 Dec
Singapore02:06 → 23:3919:020 min19:0296 min17 Dec
Sydney05:06 → 02:3920:030 min20:0377 min17 Dec
Suva06:06 → 03:3918:380 min18:3986 min17 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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