Ruling · Dattātreyotpatti (Datta Jayanti) · 2071

Sunday 6 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 37 minutes.

Decide it for

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 Sunday 6 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:51
Pūrṇimā begins 17:32:23
16:3216:5617:2017:4418:0818:3218:5619:20

79 of 116 minutes covered, the last 79

Evening of Monday 7 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

Pūrṇimā presentPradoṣa, the window the rule readsThe instant the tithi begins or ends

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 17:32 on Sun 6 Dec to 14:59 on Mon 7 Dec.

    2071-12-06T09:32:23Z → 2071-12-07T06:58:33Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 6th, 16:56–18:52 on the 7th.

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

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 79 of 116 minutes on the 6th and 0 of 116 on the 7th.

    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 2197 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2071: Sunday 6 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2071 falls on Sunday 6 December. Pūrṇimā runs from 17:32 on Sun 6 Dec to 14:59 on Mon 7 Dec and covers 79 of 116 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/2071/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 6 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 6 Dec
compat-drikpanchangComparison profileSun 6 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 6thCoveredSunset 7thCoveredRuled
Los Angeles01:32 → 22:5916:43112 min16:430 min6 Dec
Chicago03:32 → 00:5916:19118 min16:190 min6 Dec
Jersey City04:32 → 01:5916:29117 min16:280 min6 Dec
Port of Spain05:32 → 02:5917:43100 min17:430 min6 Dec
London09:32 → 06:5915:52128 min15:520 min6 Dec
Durban11:32 → 08:5918:4680 min18:470 min6 Dec
Dubai13:32 → 10:5917:29107 min17:290 min6 Dec
Delhi15:02 → 12:2917:24109 min17:240 min6 Dec
Kolkata15:02 → 12:2916:52106 min16:520 min6 Dec
Singapore17:32 → 14:5918:5796 min18:570 min6 Dec
Sydney20:32 → 17:5919:5540 min19:560 min6 Dec
Suva21:32 → 18:5918:320 min18:3326 min7 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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