Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2011

Saturday 10 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 126 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 9 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 10 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 20:57 on Fri 9 Dec to 22:36 on Sat 10 Dec.

    2011-12-09T12:57:26Z → 2011-12-10T14:36:23Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 9th, 16:56–18:52 on the 10th.

    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 9th and 116 of 116 on the 10th.

    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 7547 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2011: Saturday 10 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2011 falls on Saturday 10 December. Pūrṇimā runs from 20:57 on Fri 9 Dec to 22:36 on Sat 10 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2011/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 10 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 10 Dec
compat-drikpanchangComparison profileSat 10 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 9thCoveredSunset 10thCoveredRuled
Los Angeles04:57 → 06:3616:43113 min16:440 min9 Dec
Chicago06:57 → 08:3616:19118 min16:190 min9 Dec
Jersey City07:57 → 09:3616:28117 min16:280 min9 Dec
Port of Spain08:57 → 10:3617:44100 min17:440 min9 Dec
London12:57 → 14:3615:51128 min15:510 min9 Dec
Durban14:57 → 16:3618:4880 min18:490 min9 Dec
Dubai16:57 → 18:3617:29107 min17:3067 min9 Dec
Delhi18:27 → 20:0617:2446 min17:24109 min10 Dec
Kolkata18:27 → 20:0616:5211 min16:52106 min10 Dec
Singapore20:57 → 22:3618:580 min18:5896 min10 Dec
Sydney23:57 → 01:3619:570 min19:5877 min10 Dec
Suva01:57 → 03:3619:340 min19:3487 min10 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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