Ruling · Dattātreyotpatti (Datta Jayanti) · 1969

Tuesday 23 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 287 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 Monday 22 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:00 sunsetpradoṣa ends 18:56
16:3617:0017:2417:4818:1218:3619:0019:24

0 of 117 minutes covered

Evening of Tuesday 23 December

Taken. The only evening Pūrṇimā reaches.

17:00 sunsetpradoṣa ends 18:57
16:3617:0017:2417:4818:1218:3619:0019:24

117 of 117 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 23:43 on Mon 22 Dec to 01:35 on Wed 24 Dec.

    1969-12-22T15:43:01Z → 1969-12-23T17:34:56Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:00–18:56 on the 22nd, 17:00–18:57 on the 23rd.

    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 117 minutes on the 22nd and 117 of 117 on the 23rd.

    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 17213 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1969: Tuesday 23 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1969 falls on Tuesday 23 December. Pūrṇimā runs from 23:43 on Mon 22 Dec to 01:35 on Wed 24 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1969/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingTue 23 Dec
Ahargaṇa, classicalDisc centre, no refractionTue 23 Dec
compat-drikpanchangComparison profileTue 23 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 22ndCoveredSunset 23rdCoveredRuled
Los Angeles07:43 → 09:3516:48113 min16:490 min22 Dec
Chicago09:43 → 11:3516:23119 min16:240 min22 Dec
Jersey City10:43 → 12:3516:32118 min16:330 min22 Dec
Port of Spain11:43 → 13:3517:50100 min17:500 min22 Dec
London16:43 → 18:3516:53130 min16:54101 min22 Dec
Durban17:43 → 19:3518:5680 min18:5738 min22 Dec
Dubai19:43 → 21:3517:340 min17:35107 min23 Dec
Delhi21:13 → 23:0517:290 min17:29110 min23 Dec
Kolkata21:13 → 23:0516:570 min16:58106 min23 Dec
Singapore23:13 → 01:0518:340 min18:3596 min23 Dec
Sydney01:43 → 03:3519:060 min19:0677 min23 Dec
Suva03:43 → 05:3518:410 min18:4286 min23 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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