Ruling · Dattātreyotpatti (Datta Jayanti) · 1923

Saturday 22 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 87 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 Saturday 22 December

Taken. The only evening Pūrṇimā reaches.

16:59 sunsetpradoṣa ends 18:56
16:3516:5917:2317:4718:1118:3518:5919:23

117 of 117 minutes covered

Evening of Sunday 23 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 13:43 on Sat 22 Dec to 15:33 on Sun 23 Dec.

    1923-12-22T05:43:10Z → 1923-12-23T07:32:53Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:59–18:56 on the 22nd, 17:00–18:56 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 117 of 117 minutes on the 22nd and 0 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 5207 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1923: Saturday 22 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1923 falls on Saturday 22 December. Pūrṇimā runs from 13:43 on Sat 22 Dec to 15:33 on Sun 23 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1923/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 22 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 22 Dec
compat-drikpanchangComparison profileSat 22 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 Angeles21:43 → 23:3316:48113 min16:480 min22 Dec
Chicago23:43 → 01:3316:23119 min16:230 min22 Dec
Jersey City00:43 → 02:3316:32118 min16:320 min22 Dec
Port of Spain01:43 → 03:3317:49100 min17:500 min22 Dec
London05:43 → 07:3315:53130 min15:540 min22 Dec
Durban07:43 → 09:3318:5680 min18:560 min22 Dec
Dubai09:43 → 11:3317:34108 min17:350 min22 Dec
Delhi11:13 → 13:0317:29110 min17:290 min22 Dec
Kolkata11:13 → 13:0316:57106 min16:580 min22 Dec
Singapore12:43 → 14:3318:0496 min18:050 min22 Dec
Sydney15:43 → 17:3319:0577 min19:060 min22 Dec
Suva17:43 → 19:3318:4186 min18:4152 min22 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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