Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 1985

Thursday 26 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 92 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 26 December

Taken. The only evening Pūrṇimā reaches.

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

117 of 117 minutes covered

Evening of Friday 27 December

Pūrṇimā is absent from pradoṣa. Not taken.

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

0 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 13:42 on Thu 26 Dec to 15:30 on Fri 27 Dec.

    1985-12-26T05:42:06Z → 1985-12-27T07:30:18Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:02–18:58 on the 26th, 17:02–18:59 on the 27th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 117 of 117 minutes on the 26th and 0 of 116 on the 27th.

    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 5529 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1985: Thursday 26 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1985 falls on Thursday 26 December. Pūrṇimā runs from 13:42 on Thu 26 Dec to 15:30 on Fri 27 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1985/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 26thCoveredSunset 27thCoveredRuled
Los Angeles21:42 → 23:3016:50113 min16:510 min26 Dec
Chicago23:42 → 01:3016:25119 min16:260 min26 Dec
Jersey City00:42 → 02:3016:35118 min16:350 min26 Dec
Port of Spain01:42 → 03:3017:52100 min17:520 min26 Dec
London05:42 → 07:3015:56129 min15:570 min26 Dec
Durban07:42 → 09:3018:5880 min18:580 min26 Dec
Dubai09:42 → 11:3017:37107 min17:370 min26 Dec
Delhi11:12 → 13:0017:31110 min17:320 min26 Dec
Kolkata11:12 → 13:0017:00106 min17:000 min26 Dec
Singapore13:42 → 15:3019:0696 min19:070 min26 Dec
Sydney16:42 → 18:3020:0777 min20:080 min26 Dec
Suva17:42 → 19:3018:4386 min18:4347 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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