Ruling · Dattātreyotpatti (Datta Jayanti) · 2029

Thursday 20 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 606 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 19 December

Pūrṇimā is absent from pradoṣa. Not taken.

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

0 of 117 minutes covered

Evening of Thursday 20 December

Taken. The only evening Pūrṇimā reaches.

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

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 05:01 on Thu 20 Dec to 06:47 on Fri 21 Dec.

    2029-12-19T21:00:34Z → 2029-12-20T22:46:31Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:58–18:55 on the 19th, 16:59–18:55 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 0 of 117 minutes on the 19th and 117 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 36345 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2029: Thursday 20 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2029 falls on Thursday 20 December. Pūrṇimā runs from 05:01 on Thu 20 Dec to 06:47 on Fri 21 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2029/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingThu 20 Dec
Ahargaṇa, classicalDisc centre, no refractionThu 20 Dec
compat-drikpanchangComparison profileThu 20 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 Angeles13:01 → 14:4716:47113 min16:470 min19 Dec
Chicago15:01 → 16:4716:22119 min16:2224 min19 Dec
Jersey City16:01 → 17:4716:31118 min16:3175 min19 Dec
Port of Spain17:01 → 18:4717:48100 min17:4958 min19 Dec
London21:01 → 22:4715:520 min15:53130 min20 Dec
Durban23:01 → 00:4718:550 min18:5580 min20 Dec
Dubai01:01 → 02:4717:330 min17:34107 min20 Dec
Delhi02:31 → 04:1717:280 min17:28110 min20 Dec
Kolkata02:31 → 04:1716:560 min16:56106 min20 Dec
Singapore05:01 → 06:4719:030 min19:0396 min20 Dec
Sydney08:01 → 09:4720:040 min20:0577 min20 Dec
Suva09:01 → 10:4718:400 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

About Ahargaṇa