Ruling · Dattātreyotpatti (Datta Jayanti) · 1913

Saturday 13 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 247 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 12 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:56 sunsetpradoṣa ends 18:52
16:3216:5617:2017:4418:0818:3218:5619:20

0 of 116 minutes covered

Evening of Saturday 13 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

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

How it was decided

  1. 01

    Aṅga

    Pūrṇimā runs from 23:07 on Fri 12 Dec to 23:00 on Sat 13 Dec.

    1913-12-12T15:07:05Z → 1913-12-13T14:59:59Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 12th, 16:56–18:53 on the 13th.

    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 12th and 116 of 116 on the 13th.

    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 14844 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1913: Saturday 13 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1913 falls on Saturday 13 December. Pūrṇimā runs from 23:07 on Fri 12 Dec to 23:00 on Sat 13 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1913/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 13 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 13 Dec
compat-drikpanchangComparison profileSat 13 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 12thCoveredSunset 13thCoveredRuled
Los Angeles07:07 → 07:0016:44113 min16:440 min12 Dec
Chicago09:07 → 09:0016:20119 min16:200 min12 Dec
Jersey City10:07 → 10:0016:29118 min16:290 min12 Dec
Port of Spain11:07 → 11:0017:45100 min17:450 min12 Dec
London15:07 → 15:0015:51129 min15:510 min12 Dec
Durban17:07 → 17:0018:5080 min18:510 min12 Dec
Dubai18:48 → 18:4117:1110 min17:1289 min13 Dec
Delhi20:37 → 20:3017:250 min17:25109 min13 Dec
Kolkata20:37 → 20:3016:530 min16:53106 min13 Dec
Singapore22:07 → 22:0017:590 min18:0096 min13 Dec
Sydney01:07 → 01:0018:590 min19:0077 min13 Dec
Suva03:02 → 02:5518:310 min18:3186 min13 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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