Ruling · Dattātreyotpatti (Datta Jayanti) · 1959

Monday 14 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 248 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 Monday 14 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:53
16:3216:5617:2017:4418:0818:3218:5619:20

116 of 116 minutes covered

Evening of Tuesday 15 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 10:18 on Mon 14 Dec to 12:49 on Tue 15 Dec.

    1959-12-14T02:17:43Z → 1959-12-15T04:48:48Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:53 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 116 of 116 minutes on the 14th and 0 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 14869 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1959: Monday 14 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1959 falls on Monday 14 December. Pūrṇimā runs from 10:18 on Mon 14 Dec to 12:49 on Tue 15 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1959/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingMon 14 Dec
Ahargaṇa, classicalDisc centre, no refractionMon 14 Dec
compat-drikpanchangComparison profileMon 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 Angeles18:18 → 20:4916:45113 min16:450 min14 Dec
Chicago20:18 → 22:4916:20119 min16:200 min14 Dec
Jersey City21:18 → 23:4916:29118 min16:290 min14 Dec
Port of Spain22:18 → 00:4917:46100 min17:460 min14 Dec
London02:18 → 04:4915:51129 min15:510 min14 Dec
Durban04:18 → 06:4918:5180 min18:520 min14 Dec
Dubai06:18 → 08:4917:31107 min17:310 min14 Dec
Delhi07:48 → 10:1917:25109 min17:260 min14 Dec
Kolkata07:48 → 10:1916:54106 min16:540 min14 Dec
Singapore09:48 → 12:1918:3096 min18:310 min14 Dec
Sydney12:18 → 14:4919:0177 min19:010 min14 Dec
Suva14:18 → 16:4918:3686 min18:370 min14 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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