Ruling · Dattātreyotpatti (Datta Jayanti) · 2024

Sunday 15 December

Boundaryin Baoding, under the Rashtriya Panchang method. A threshold is only 4 min 51 s away. Say “contested”.

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 Saturday 14 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:53
16:3316:5717:2117:4518:0918:3318:5719:21

0 of 116 minutes covered

Evening of Sunday 15 December

Taken. The only evening Pūrṇimā reaches.

16:57 sunsetpradoṣa ends 18:53
Pūrṇimā ends 17:01:41
16:3316:5717:2117:4518:0918:3318:5719:21

5 of 116 minutes covered, the first 5

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 19:29 on Sat 14 Dec to 17:02 on Sun 15 Dec.

    2024-12-14T11:29:08Z → 2024-12-15T09:01:41Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:53 on the 14th, 16:57–18:53 on the 15th.

    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 116 minutes on the 14th and 5 of 116 on the 15th.

    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 291 s < 300 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2024: Sunday 15 December.

    confidence: boundary (margin)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2024 falls on Sunday 15 December. Pūrṇimā runs from 19:29 on Sat 14 Dec to 17:02 on Sun 15 Dec and covers 5 of 116 minutes of pradoṣa that evening. It is 4 min 51 s from a threshold: treat the date as contested.

ahargana.org/baoding/festivals/2024/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 15 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 15 Dec
compat-drikpanchangComparison profileSat 14 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 14thCoveredSunset 15thCoveredRuled
Los Angeles03:29 → 01:0216:45113 min16:450 min14 Dec
Chicago05:29 → 03:0216:20119 min16:200 min14 Dec
Jersey City06:29 → 04:0216:29118 min16:300 min14 Dec
Port of Spain07:29 → 05:0217:46100 min17:460 min14 Dec
London11:29 → 09:0215:51129 min15:510 min14 Dec
Durban13:29 → 11:0218:5280 min18:530 min14 Dec
Dubai15:29 → 13:0217:31107 min17:310 min14 Dec
Delhi16:59 → 14:3217:26109 min17:260 min14 Dec
Kolkata16:59 → 14:3216:54101 min16:540 min14 Dec
Singapore19:29 → 17:0219:0167 min19:010 min14 Dec
Sydney22:29 → 20:0220:010 min20:020 min14 Dec
Suva23:29 → 21:0218:370 min18:3886 min15 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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