Ruling · Dattātreyotpatti (Datta Jayanti) · 2038

Saturday 11 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 262 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 10 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 Saturday 11 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 23:14 on Fri 10 Dec to 01:30 on Sun 12 Dec.

    2038-12-10T15:13:37Z → 2038-12-11T17:30:28Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 10th, 16:56–18:52 on the 11th.

    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 10th and 116 of 116 on the 11th.

    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 15705 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2038: Saturday 11 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2038 falls on Saturday 11 December. Pūrṇimā runs from 23:14 on Fri 10 Dec to 01:30 on Sun 12 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2038/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 11 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 11 Dec
compat-drikpanchangComparison profileSat 11 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 10thCoveredSunset 11thCoveredRuled
Los Angeles07:14 → 09:3016:44113 min16:440 min10 Dec
Chicago09:14 → 11:3016:19119 min16:190 min10 Dec
Jersey City10:14 → 12:3016:28118 min16:290 min10 Dec
Port of Spain11:14 → 13:3017:44100 min17:450 min10 Dec
London15:14 → 17:3015:51129 min15:51100 min10 Dec
Durban17:14 → 19:3018:4980 min18:5041 min10 Dec
Dubai19:14 → 21:3017:303 min17:30107 min11 Dec
Delhi20:44 → 23:0017:240 min17:25109 min11 Dec
Kolkata20:44 → 23:0016:530 min16:53106 min11 Dec
Singapore23:14 → 01:3018:590 min18:5996 min11 Dec
Sydney02:14 → 04:3019:580 min19:5977 min11 Dec
Suva03:14 → 05:3018:340 min18:3587 min11 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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