Ruling · Dattātreyotpatti (Datta Jayanti) · 2086

Thursday 19 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 22 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 Thursday 19 December

Taken. The only evening Pūrṇimā reaches.

16:58 sunsetpradoṣa ends 18:55
Pūrṇimā begins 18:33:22
16:3416:5817:2217:4618:1018:3418:5819:22

22 of 117 minutes covered, the last 22

Evening of Friday 20 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:59 sunsetpradoṣa ends 18:56
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 18:33 on Thu 19 Dec to 16:20 on Fri 20 Dec.

    2086-12-19T10:33:23Z → 2086-12-20T08:20:28Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:55 on the 19th, 16:59–18:56 on the 20th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 22 of 117 minutes on the 19th and 0 of 117 on the 20th.

    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 1300 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2086: Thursday 19 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2086 falls on Thursday 19 December. Pūrṇimā runs from 18:33 on Thu 19 Dec to 16:20 on Fri 20 Dec and covers 22 of 117 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/2086/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 19thCoveredSunset 20thCoveredRuled
Los Angeles02:33 → 00:2016:47113 min16:470 min19 Dec
Chicago04:33 → 02:2016:22119 min16:220 min19 Dec
Jersey City05:33 → 03:2016:31118 min16:320 min19 Dec
Port of Spain06:33 → 04:2017:48100 min17:490 min19 Dec
London10:33 → 08:2015:52130 min15:530 min19 Dec
Durban12:33 → 10:2018:5580 min18:560 min19 Dec
Dubai14:33 → 12:2017:33107 min17:340 min19 Dec
Delhi16:03 → 13:5017:28110 min17:280 min19 Dec
Kolkata16:03 → 13:5016:56106 min16:570 min19 Dec
Singapore18:33 → 16:2019:0396 min19:040 min19 Dec
Sydney21:33 → 19:2020:040 min20:050 min19 Dec
Suva22:33 → 20:2018:400 min18:4086 min20 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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