Ruling · Dattātreyotpatti (Dattātreya Jayantī) · 2015

Friday 25 December

Determinatein Baoding, under the Rashtriya Panchang method. Clear of every threshold by 14 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 Thursday 24 December

Pūrṇimā is absent from pradoṣa. Not taken.

17:00 sunsetpradoṣa ends 18:57
16:3617:0017:2417:4818:1218:3619:0019:24

0 of 117 minutes covered

Evening of Friday 25 December

Taken. The only evening Pūrṇimā reaches.

17:01 sunsetpradoṣa ends 18:58
Pūrṇimā ends 19:11:28
16:3717:0117:2517:4918:1318:3719:0119:25

117 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 20:57 on Thu 24 Dec to 19:11 on Fri 25 Dec.

    2015-12-24T12:57:25Z → 2015-12-25T11:11:28Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 17:00–18:57 on the 24th, 17:01–18:58 on the 25th.

    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 117 minutes on the 24th and 117 of 117 on the 25th.

    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 835 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2015: Friday 25 December.

    confidence: determinate

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2015 falls on Friday 25 December. Pūrṇimā runs from 20:57 on Thu 24 Dec to 19:11 on Fri 25 Dec and covers all of pradoṣa that evening.

ahargana.org/baoding/festivals/2015/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 25 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 25 Dec
compat-drikpanchangComparison profileFri 25 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 24thCoveredSunset 25thCoveredRuled
Los Angeles04:57 → 03:1116:49113 min16:490 min24 Dec
Chicago06:57 → 05:1116:24119 min16:250 min24 Dec
Jersey City07:57 → 06:1116:33118 min16:340 min24 Dec
Port of Spain08:57 → 07:1117:50100 min17:510 min24 Dec
London12:57 → 11:1115:55129 min15:550 min24 Dec
Durban14:57 → 13:1118:5780 min18:570 min24 Dec
Dubai16:57 → 15:1117:35107 min17:360 min24 Dec
Delhi18:27 → 16:4117:3052 min17:300 min24 Dec
Kolkata18:27 → 16:4116:5817 min16:590 min24 Dec
Singapore20:57 → 19:1119:050 min19:066 min25 Dec
Sydney23:57 → 22:1120:060 min20:0777 min25 Dec
Suva01:57 → 00:1119:420 min19:4286 min25 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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