Ruling · Dattātreyotpatti (Datta Jayanti) · 1916

Saturday 9 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 36 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 8 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 9 December

Taken. The only evening Pūrṇimā reaches.

16:56 sunsetpradoṣa ends 18:52
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 19:28 on Fri 8 Dec to 20:43 on Sat 9 Dec.

    1916-12-08T11:27:33Z → 1916-12-09T12:43:27Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:56–18:52 on the 8th, 16:56–18:52 on the 9th.

    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 8th and 116 of 116 on the 9th.

    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 2154 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 1916: Saturday 9 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 1916 falls on Saturday 9 December. Pūrṇimā runs from 19:28 on Fri 8 Dec to 20:43 on Sat 9 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/1916/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingSat 9 Dec
Ahargaṇa, classicalDisc centre, no refractionSat 9 Dec
compat-drikpanchangComparison profileSat 9 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 8thCoveredSunset 9thCoveredRuled
Los Angeles03:28 → 04:4316:43113 min16:440 min8 Dec
Chicago05:28 → 06:4316:19118 min16:190 min8 Dec
Jersey City06:28 → 07:4316:28117 min16:290 min8 Dec
Port of Spain07:28 → 08:4317:44100 min17:440 min8 Dec
London11:28 → 12:4315:52128 min15:510 min8 Dec
Durban13:28 → 14:4318:4880 min18:480 min8 Dec
Dubai15:09 → 16:2417:10107 min17:110 min8 Dec
Delhi16:58 → 18:1317:24109 min17:2449 min8 Dec
Kolkata16:58 → 18:1316:52100 min16:5281 min8 Dec
Singapore18:28 → 19:4317:5866 min17:5896 min9 Dec
Sydney21:28 → 22:4318:570 min18:5777 min9 Dec
Suva23:28 → 00:4318:330 min18:3487 min9 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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