Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2002

Thursday 19 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 441 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

Pūrṇimā is absent from pradoṣa. Not taken.

16:58 sunsetpradoṣa ends 18:54
16:3416:5817:2217:4618:1018:3418:5819:22

0 of 117 minutes covered

Evening of Thursday 19 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 02:15 on Thu 19 Dec to 03:10 on Fri 20 Dec.

    2002-12-18T18:14:58Z → 2002-12-19T19:10:10Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:54 on the 18th, 16:58–18:55 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 0 of 117 minutes on the 18th and 117 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 26443 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2002: Thursday 19 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2002 falls on Thursday 19 December. Pūrṇimā runs from 02:15 on Thu 19 Dec to 03:10 on Fri 20 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2002/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 19 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 19 Dec
compat-drikpanchangComparison profileThu 19 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 Angeles10:15 → 11:1016:46113 min16:460 min18 Dec
Chicago12:15 → 13:1016:21119 min16:210 min18 Dec
Jersey City13:15 → 14:1016:30118 min16:310 min18 Dec
Port of Spain14:15 → 15:1017:48100 min17:480 min18 Dec
London18:15 → 19:1015:520 min15:52130 min19 Dec
Durban20:15 → 21:1018:540 min18:5580 min19 Dec
Dubai22:15 → 23:1017:320 min17:33107 min19 Dec
Delhi23:45 → 00:4017:270 min17:27110 min19 Dec
Kolkata23:45 → 00:4016:550 min16:56106 min19 Dec
Singapore02:15 → 03:1019:020 min19:0396 min19 Dec
Sydney05:15 → 06:1020:030 min20:0477 min19 Dec
Suva06:15 → 07:1018:390 min18:3986 min19 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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