Ruling · Dattātreyotpatti (Datta Jayanti) · 2097

Wednesday 18 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 316 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 Wednesday 18 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:55
16:3416:5817:2217:4618:1018:3418:5819:22

117 of 117 minutes covered

Evening of Thursday 19 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:59 sunsetpradoṣa ends 18:55
16:3516:5917:2317:4718:1118:3518:5919:23

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 11:42 on Wed 18 Dec to 08:06 on Thu 19 Dec.

    2097-12-18T03:42:21Z → 2097-12-19T00:05:47Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:55 on the 18th, 16:59–18:55 on the 19th.

    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 18th and 0 of 117 on the 19th.

    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 18953 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2097: Wednesday 18 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2097 falls on Wednesday 18 December. Pūrṇimā runs from 11:42 on Wed 18 Dec to 08:06 on Thu 19 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2097/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 18 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 18 Dec
compat-drikpanchangComparison profileWed 18 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 18thCoveredSunset 19thCoveredRuled
Los Angeles19:42 → 16:0616:470 min16:470 min17 Dec
Chicago21:42 → 18:0616:22104 min16:220 min18 Dec
Jersey City22:42 → 19:0616:31118 min16:310 min18 Dec
Port of Spain23:42 → 20:0617:48100 min17:490 min18 Dec
London03:42 → 00:0615:52130 min15:530 min18 Dec
Durban05:42 → 02:0618:5580 min18:550 min18 Dec
Dubai07:42 → 04:0617:33107 min17:330 min18 Dec
Delhi09:12 → 05:3617:28110 min17:280 min18 Dec
Kolkata09:12 → 05:3616:56106 min16:560 min18 Dec
Singapore11:42 → 08:0619:0396 min19:030 min18 Dec
Sydney14:42 → 11:0620:0477 min20:050 min18 Dec
Suva15:42 → 12:0618:4086 min18:400 min18 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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