Ruling · Dattātreyotpatti (Datta Jayanti) · 1935

Monday 9 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 250 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 Monday 9 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

Evening of Tuesday 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 12:46 on Mon 9 Dec to 11:10 on Tue 10 Dec.

    1935-12-09T04:46:02Z → 1935-12-10T03:10:14Z

  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 116 of 116 minutes on the 9th and 0 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 14984 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1935: Monday 9 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1935 falls on Monday 9 December. Pūrṇimā runs from 12:46 on Mon 9 Dec to 11:10 on Tue 10 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1935/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 9 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 9 Dec
compat-drikpanchangComparison profileMon 9 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 Angeles20:46 → 19:1016:43113 min16:440 min9 Dec
Chicago22:46 → 21:1016:19118 min16:190 min9 Dec
Jersey City23:46 → 22:1016:28117 min16:290 min9 Dec
Port of Spain00:46 → 23:1017:44100 min17:440 min9 Dec
London04:46 → 03:1015:52128 min15:510 min9 Dec
Durban06:46 → 05:1018:4880 min18:490 min9 Dec
Dubai08:46 → 07:1017:29107 min17:300 min9 Dec
Delhi10:16 → 08:4017:24109 min17:240 min9 Dec
Kolkata10:16 → 08:4016:52106 min16:520 min9 Dec
Singapore12:06 → 10:3018:1896 min18:180 min9 Dec
Sydney14:46 → 13:1018:5777 min18:580 min9 Dec
Suva16:46 → 15:1018:3387 min18:340 min9 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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