Ruling · Dattātreyotpatti (Datta Jayanti) · 2045

Saturday 23 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 361 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 Saturday 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

Evening of Sunday 24 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:01 sunsetpradoṣa ends 18:57
16:3717:0117:2517:4918:1318:3719:0119:25

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 10:59 on Sat 23 Dec to 08:49 on Sun 24 Dec.

    2045-12-23T02:58:46Z → 2045-12-24T00:49:22Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:00–18:57 on the 23rd, 17:01–18:57 on the 24th.

    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 23rd and 0 of 117 on the 24th.

    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 21688 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2045: Saturday 23 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2045 falls on Saturday 23 December. Pūrṇimā runs from 10:59 on Sat 23 Dec to 08:49 on Sun 24 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2045/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 23 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 23 Dec
compat-drikpanchangComparison profileSat 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 23rdCoveredSunset 24thCoveredRuled
Los Angeles18:59 → 16:4916:491 min16:490 min23 Dec
Chicago20:59 → 18:4916:24119 min16:240 min23 Dec
Jersey City21:59 → 19:4916:33118 min16:340 min23 Dec
Port of Spain22:59 → 20:4917:50100 min17:510 min23 Dec
London02:59 → 00:4915:54130 min15:550 min23 Dec
Durban04:59 → 02:4918:5780 min18:570 min23 Dec
Dubai06:59 → 04:4917:35107 min17:360 min23 Dec
Delhi08:29 → 06:1917:30110 min17:300 min23 Dec
Kolkata08:29 → 06:1916:58106 min16:590 min23 Dec
Singapore10:59 → 08:4919:0596 min19:050 min23 Dec
Sydney13:59 → 11:4920:0677 min20:070 min23 Dec
Suva14:59 → 12:4918:4286 min18:420 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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