Ruling · Dattātreyotpatti (Datta Jayanti) · 2080

Thursday 26 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 366 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 Wednesday 25 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:02 sunsetpradoṣa ends 18:58
16:3817:0217:2617:5018:1418:3819:0219:26

0 of 117 minutes covered

Evening of Thursday 26 December

Taken. The only evening Pūrṇimā reaches.

17:02 sunsetpradoṣa ends 18:59
16:3817:0217:2617:5018:1418:3819:0219:26

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 04:08 on Thu 26 Dec to 01:05 on Fri 27 Dec.

    2080-12-25T20:07:50Z → 2080-12-26T17:04:32Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:02–18:58 on the 25th, 17:02–18:59 on the 26th.

    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 25th and 116 of 116 on the 26th.

    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 21935 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2080: Thursday 26 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2080 falls on Thursday 26 December. Pūrṇimā runs from 04:08 on Thu 26 Dec to 01:05 on Fri 27 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2080/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 26 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 26 Dec
compat-drikpanchangComparison profileThu 26 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 25thCoveredSunset 26thCoveredRuled
Los Angeles12:08 → 09:0516:50113 min16:510 min25 Dec
Chicago14:08 → 11:0516:25119 min16:260 min25 Dec
Jersey City15:08 → 12:0516:35118 min16:350 min25 Dec
Port of Spain16:08 → 13:0517:52100 min17:520 min25 Dec
London20:08 → 17:0515:560 min15:5768 min26 Dec
Durban22:08 → 19:0518:580 min18:586 min26 Dec
Dubai00:08 → 21:0517:370 min17:37107 min26 Dec
Delhi01:38 → 22:3517:310 min17:32109 min26 Dec
Kolkata01:38 → 22:3517:000 min17:00106 min26 Dec
Singapore04:08 → 01:0519:060 min19:0796 min26 Dec
Sydney07:08 → 04:0520:070 min20:0877 min26 Dec
Suva08:08 → 05:0518:430 min18:4386 min26 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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