Ruling · Dattātreyotpatti (Datta Jayanti) · 1938

Wednesday 7 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 29 minutes.

Decide it for

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 Tuesday 6 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:51
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 116 minutes covered

Evening of Wednesday 7 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:51
Pūrṇimā ends 18:22:07
16:3216:5617:2017:4418:0818:3218:5619:20

86 of 116 minutes covered, the first 86

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 21:14 on Tue 6 Dec to 18:22 on Wed 7 Dec.

    1938-12-06T13:14:10Z → 1938-12-07T10:22:08Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 6th, 16:56–18:51 on the 7th.

    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 6th and 86 of 116 on the 7th.

    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 1761 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1938: Wednesday 7 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1938 falls on Wednesday 7 December. Pūrṇimā runs from 21:14 on Tue 6 Dec to 18:22 on Wed 7 Dec and covers 86 of 116 minutes of pradoṣa that evening.

ahargana.org/baoding/festivals/1938/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingWed 7 Dec
Ahargaṇa, classicalDisc centre, no refractionWed 7 Dec
compat-drikpanchangComparison profileWed 7 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 6thCoveredSunset 7thCoveredRuled
Los Angeles05:14 → 02:2216:43112 min16:430 min6 Dec
Chicago07:14 → 04:2216:19118 min16:190 min6 Dec
Jersey City08:14 → 05:2216:29117 min16:280 min6 Dec
Port of Spain09:14 → 06:2217:43100 min17:430 min6 Dec
London13:14 → 10:2215:52128 min15:520 min6 Dec
Durban15:14 → 12:2218:4680 min18:470 min6 Dec
Dubai17:14 → 14:2217:29107 min17:290 min6 Dec
Delhi18:44 → 15:5217:2428 min17:240 min6 Dec
Kolkata18:44 → 15:5216:520 min16:520 min6 Dec
Singapore20:34 → 17:4218:170 min18:170 min6 Dec
Sydney23:14 → 20:2218:550 min18:5578 min7 Dec
Suva01:14 → 22:2218:320 min18:3287 min7 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

About Ahargaṇa