Ruling · Dattātreyotpatti (Datta Jayanti) · 1967

Saturday 16 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 576 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 16 December

Taken. The only evening Pūrṇimā reaches.

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

116 of 116 minutes covered

Evening of Sunday 17 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:54
16:3316:5717:2117:4518:0918:3318:5719:21

0 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 05:40 on Sat 16 Dec to 07:21 on Sun 17 Dec.

    1967-12-15T21:39:33Z → 1967-12-16T23:21:19Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:53 on the 16th, 16:57–18:54 on the 17th.

    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 16th and 0 of 117 on the 17th.

    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 34552 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1967: Saturday 16 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1967 falls on Saturday 16 December. Pūrṇimā runs from 05:40 on Sat 16 Dec to 07:21 on Sun 17 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1967/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 16 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 16 Dec
compat-drikpanchangComparison profileSat 16 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 15thCoveredSunset 16thCoveredRuled
Los Angeles13:40 → 15:2116:45113 min16:450 min15 Dec
Chicago15:40 → 17:2116:20119 min16:2061 min15 Dec
Jersey City16:40 → 18:2116:29108 min16:30112 min16 Dec
Port of Spain17:40 → 19:2117:46100 min17:4795 min15 Dec
London21:40 → 23:2115:510 min15:51129 min16 Dec
Durban23:40 → 01:2118:520 min18:5380 min16 Dec
Dubai01:40 → 03:2117:310 min17:31107 min16 Dec
Delhi03:10 → 04:5117:260 min17:26110 min16 Dec
Kolkata03:10 → 04:5116:540 min16:54106 min16 Dec
Singapore05:10 → 06:5118:310 min18:3196 min16 Dec
Sydney07:40 → 09:2119:010 min19:0277 min16 Dec
Suva09:40 → 11:2118:370 min18:3886 min16 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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