Ruling · Dattātreyotpatti (Datta Jayanti) · 1930

Friday 5 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 421 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 Friday 5 December

Taken. The only evening Pūrṇimā reaches.

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

115 of 115 minutes covered

Evening of Saturday 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 09:55 on Fri 5 Dec to 08:40 on Sat 6 Dec.

    1930-12-05T01:54:34Z → 1930-12-06T00:39:47Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:51 on the 5th, 16:56–18:51 on the 6th.

    pradosha: night-muhurta-1-2 · sunrise and sunset: upper limb, 31′ + 16′

  3. 03

    Rule

    Pūrṇimā must be present during pradoṣa. It covers 115 of 115 minutes on the 5th and 0 of 116 on the 6th.

    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 25280 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1930: Friday 5 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1930 falls on Friday 5 December. Pūrṇimā runs from 09:55 on Fri 5 Dec to 08:40 on Sat 6 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1930/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 5 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 5 Dec
compat-drikpanchangComparison profileFri 5 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 5thCoveredSunset 6thCoveredRuled
Los Angeles17:55 → 16:4016:430 min16:430 min4 Dec
Chicago19:55 → 18:4016:20118 min16:190 min5 Dec
Jersey City20:55 → 19:4016:29117 min16:290 min5 Dec
Port of Spain21:55 → 20:4017:42100 min17:430 min5 Dec
London01:55 → 00:4015:53128 min15:520 min5 Dec
Durban03:55 → 02:4018:4580 min18:460 min5 Dec
Dubai05:55 → 04:4017:29107 min17:290 min5 Dec
Delhi07:25 → 06:1017:24109 min17:240 min5 Dec
Kolkata07:25 → 06:1016:51106 min16:520 min5 Dec
Singapore08:55 → 07:4017:5696 min17:570 min5 Dec
Sydney11:55 → 10:4018:5478 min18:550 min5 Dec
Suva13:55 → 12:4018:3187 min18:320 min5 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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