Ruling · Dattātreyotpatti (Datta Jayanti) · 1902

Sunday 14 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 82 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 Sunday 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 Monday 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 15:34 on Sun 14 Dec to 11:47 on Mon 15 Dec.

    1902-12-14T07:34:10Z → 1902-12-15T03:47:22Z

  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 4935 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1902: Sunday 14 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1902 falls on Sunday 14 December. Pūrṇimā runs from 15:34 on Sun 14 Dec to 11:47 on Mon 15 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1902/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 14 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 14 Dec
compat-drikpanchangComparison profileSun 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 Angeles23:34 → 19:4716:45113 min16:450 min14 Dec
Chicago01:34 → 21:4716:20119 min16:200 min14 Dec
Jersey City02:34 → 22:4716:29118 min16:290 min14 Dec
Port of Spain03:34 → 23:4717:46100 min17:460 min14 Dec
London07:34 → 03:4715:51129 min15:510 min14 Dec
Durban09:04 → 05:1718:2180 min18:220 min14 Dec
Dubai11:15 → 07:2817:12107 min17:120 min14 Dec
Delhi12:55 → 09:0817:16109 min17:170 min14 Dec
Kolkata12:55 → 09:0816:45106 min16:450 min14 Dec
Singapore14:29 → 10:4217:5596 min17:560 min14 Dec
Sydney17:34 → 13:4719:0177 min19:010 min14 Dec
Suva19:29 → 15:4218:3129 min18:320 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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