Ruling · Dattātreyotpatti (Datta Jayanti) · 1953

Sunday 20 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 48 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 Saturday 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 Sunday 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 21:27 on Sat 19 Dec to 19:43 on Sun 20 Dec.

    1953-12-19T13:27:04Z → 1953-12-20T11:43:28Z

  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 2900 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1953: Sunday 20 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1953 falls on Sunday 20 December. Pūrṇimā runs from 21:27 on Sat 19 Dec to 19:43 on Sun 20 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1953/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSun 20 Dec
Ahargaṇa, classicalDisc centre, no refractionSun 20 Dec
compat-drikpanchangComparison profileSun 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 Angeles05:27 → 03:4316:46113 min16:470 min19 Dec
Chicago07:27 → 05:4316:22119 min16:220 min19 Dec
Jersey City08:27 → 06:4316:31118 min16:310 min19 Dec
Port of Spain09:27 → 07:4317:48100 min17:490 min19 Dec
London13:27 → 11:4315:52130 min15:520 min19 Dec
Durban15:27 → 13:4318:5580 min18:550 min19 Dec
Dubai17:27 → 15:4317:33107 min17:330 min19 Dec
Delhi18:57 → 17:1317:2720 min17:280 min19 Dec
Kolkata18:57 → 17:1316:560 min16:5617 min20 Dec
Singapore20:57 → 19:1318:330 min18:3340 min20 Dec
Sydney23:27 → 21:4319:040 min19:0577 min20 Dec
Suva01:27 → 23:4318:400 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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