Ruling · Dattātreyotpatti (Datta Jayanti) · 2062

Friday 15 December

Boundaryin Baoding, under the Rashtriya Panchang method. Pūrṇimā reaches pradoṣa on neither day and the rule does not say what then. Say “contested”.

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 Friday 15 December

Taken. Pūrṇimā reaches neither evening; this is the day it falls on.

16:57 sunsetpradoṣa ends 18:53
16:3316:5717:2117:4518:0918:3318:5719:21

0 of 116 minutes covered

Evening of Saturday 16 December

Pūrṇimā is absent from pradoṣa. Not taken.

16:57 sunsetpradoṣa ends 18:54
16:3316:5717:2117:4518:0918:3318:5719:21

0 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 19:27 on Fri 15 Dec to 16:18 on Sat 16 Dec.

    2062-12-15T11:27:01Z → 2062-12-16T08:18:10Z

  2. 02

    Kāla

    Pradoṣa is 2 muhūrtas after sunset: 16:57–18:53 on the 15th, 16:57–18:54 on the 16th.

    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 15th and 0 of 117 on the 16th.

    Calendar Reform Committee 1955, General Rules for Religious Festivals, p. 104

  4. 04

    Tie-break

    Neither evening qualifies. The day the tithi falls on is taken.

    priority: unstated → tithi-day · margin 2024 s

  5. 05

    Ruling

    Dattātreyotpatti, Baoding, 2062: Friday 15 December.

    confidence: boundary (absent-unstated)

Say it like this

In Baoding, Dattātreyotpatti (Datta Jayanti) 2062 falls on Friday 15 December. Pūrṇimā runs from 19:27 on Fri 15 Dec to 16:18 on Sat 16 Dec, and reaches pradoṣa on neither day.

ahargana.org/baoding/festivals/2062/dattatreyotpatti · pac-rp@2026.1

Who says what

AuthorityKindDate
Ahargaṇa, pac-rpThis rulingFri 15 Dec
Ahargaṇa, classicalDisc centre, no refractionFri 15 Dec
compat-drikpanchangComparison profileFri 15 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 15thCoveredSunset 16thCoveredRuled
Los Angeles03:27 → 00:1816:45113 min16:450 min15 Dec
Chicago05:27 → 02:1816:20119 min16:210 min15 Dec
Jersey City06:27 → 03:1816:30118 min16:300 min15 Dec
Port of Spain07:27 → 04:1817:46100 min17:470 min15 Dec
London11:27 → 08:1815:51129 min15:510 min15 Dec
Durban13:27 → 10:1818:5380 min18:530 min15 Dec
Dubai15:27 → 12:1817:31107 min17:320 min15 Dec
Delhi16:57 → 13:4817:26109 min17:260 min15 Dec
Kolkata16:57 → 13:4816:54103 min16:550 min15 Dec
Singapore19:27 → 16:1819:0170 min19:020 min15 Dec
Sydney22:27 → 19:1820:020 min20:020 min15 Dec
Suva23:27 → 20:1818:370 min18:3886 min16 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