Ruling · Dattātreyotpatti (Datta Jayanti) · 1973

Sunday 9 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 236 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 Sunday 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 Monday 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 13:00 on Sun 9 Dec to 09:35 on Mon 10 Dec.

    1973-12-09T04:59:55Z → 1973-12-10T01:34:36Z

  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 14150 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1973: Sunday 9 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1973 falls on Sunday 9 December. Pūrṇimā runs from 13:00 on Sun 9 Dec to 09:35 on Mon 10 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1973/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 9 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 9 Dec
compat-drikpanchangComparison profileSun 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 Angeles21:00 → 17:3516:4451 min16:440 min9 Dec
Chicago23:00 → 19:3516:19118 min16:190 min9 Dec
Jersey City00:00 → 20:3516:28118 min16:290 min9 Dec
Port of Spain01:00 → 21:3517:44100 min17:440 min9 Dec
London05:00 → 01:3515:51129 min15:510 min9 Dec
Durban07:00 → 03:3518:4880 min18:490 min9 Dec
Dubai09:00 → 05:3517:29107 min17:300 min9 Dec
Delhi10:30 → 07:0517:24109 min17:240 min9 Dec
Kolkata10:30 → 07:0516:52106 min16:530 min9 Dec
Singapore12:30 → 09:0518:2896 min18:290 min9 Dec
Sydney16:00 → 12:3519:5777 min19:580 min9 Dec
Suva17:00 → 13:3518:3487 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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